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Type | Label | Description |
---|---|---|
Statement | ||
Theorem | prmgap 15601* | The prime gap theorem: for each positive integer there are (at least) two successive primes with a difference ("gap") at least as big as the given integer. (Contributed by AV, 13-Aug-2020.) |
⊢ ∀𝑛 ∈ ℕ ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑛 ≤ (𝑞 − 𝑝) ∧ ∀𝑧 ∈ ((𝑝 + 1)..^𝑞)𝑧 ∉ ℙ) | ||
Theorem | prmgaplcm 15602* | Alternate proof of prmgap 15601: in contrast to prmgap 15601, where the gap starts at n! , the factorial of n, the gap starts at the least common multiple of all positive integers less than or equal to n. (Contributed by AV, 13-Aug-2020.) (Revised by AV, 27-Aug-2020.) (Proof modification is discouraged.) (New usage is discouraged.) |
⊢ ∀𝑛 ∈ ℕ ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑛 ≤ (𝑞 − 𝑝) ∧ ∀𝑧 ∈ ((𝑝 + 1)..^𝑞)𝑧 ∉ ℙ) | ||
Theorem | prmgapprmolem 15603 | Lemma for prmgapprmo 15604: The primorial of a number plus an integer greater than 1 and less then or equal to the number are not coprime. (Contributed by AV, 15-Aug-2020.) (Revised by AV, 29-Aug-2020.) |
⊢ ((𝑁 ∈ ℕ ∧ 𝐼 ∈ (2...𝑁)) → 1 < (((#p‘𝑁) + 𝐼) gcd 𝐼)) | ||
Theorem | prmgapprmo 15604* | Alternate proof of prmgap 15601: in contrast to prmgap 15601, where the gap starts at n! , the factorial of n, the gap starts at n#, the primorial of n. (Contributed by AV, 15-Aug-2020.) (Revised by AV, 29-Aug-2020.) (Proof modification is discouraged.) (New usage is discouraged.) |
⊢ ∀𝑛 ∈ ℕ ∃𝑝 ∈ ℙ ∃𝑞 ∈ ℙ (𝑛 ≤ (𝑞 − 𝑝) ∧ ∀𝑧 ∈ ((𝑝 + 1)..^𝑞)𝑧 ∉ ℙ) | ||
Theorem | dec2dvds 15605 | Divisibility by two is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ0 & ⊢ (𝐵 · 2) = 𝐶 & ⊢ 𝐷 = (𝐶 + 1) ⇒ ⊢ ¬ 2 ∥ ;𝐴𝐷 | ||
Theorem | dec5dvds 15606 | Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ & ⊢ 𝐵 < 5 ⇒ ⊢ ¬ 5 ∥ ;𝐴𝐵 | ||
Theorem | dec5dvds2 15607 | Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ & ⊢ 𝐵 < 5 & ⊢ (5 + 𝐵) = 𝐶 ⇒ ⊢ ¬ 5 ∥ ;𝐴𝐶 | ||
Theorem | dec5nprm 15608 | Divisibility by five is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.) |
⊢ 𝐴 ∈ ℕ ⇒ ⊢ ¬ ;𝐴5 ∈ ℙ | ||
Theorem | dec2nprm 15609 | Divisibility by two is obvious in base 10. (Contributed by Mario Carneiro, 19-Apr-2015.) |
⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ (𝐵 · 2) = 𝐶 ⇒ ⊢ ¬ ;𝐴𝐶 ∈ ℙ | ||
Theorem | modxai 15610 | Add exponents in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.) (Revised by Mario Carneiro, 5-Feb-2015.) |
⊢ 𝑁 ∈ ℕ & ⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℤ & ⊢ 𝐾 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ 𝐶 ∈ ℕ0 & ⊢ 𝐿 ∈ ℕ0 & ⊢ ((𝐴↑𝐵) mod 𝑁) = (𝐾 mod 𝑁) & ⊢ ((𝐴↑𝐶) mod 𝑁) = (𝐿 mod 𝑁) & ⊢ (𝐵 + 𝐶) = 𝐸 & ⊢ ((𝐷 · 𝑁) + 𝑀) = (𝐾 · 𝐿) ⇒ ⊢ ((𝐴↑𝐸) mod 𝑁) = (𝑀 mod 𝑁) | ||
Theorem | mod2xi 15611 | Double exponents in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.) |
⊢ 𝑁 ∈ ℕ & ⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℤ & ⊢ 𝐾 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ ((𝐴↑𝐵) mod 𝑁) = (𝐾 mod 𝑁) & ⊢ (2 · 𝐵) = 𝐸 & ⊢ ((𝐷 · 𝑁) + 𝑀) = (𝐾 · 𝐾) ⇒ ⊢ ((𝐴↑𝐸) mod 𝑁) = (𝑀 mod 𝑁) | ||
Theorem | modxp1i 15612 | Add one to an exponent in a power mod calculation. (Contributed by Mario Carneiro, 21-Feb-2014.) |
⊢ 𝑁 ∈ ℕ & ⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℤ & ⊢ 𝐾 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ ((𝐴↑𝐵) mod 𝑁) = (𝐾 mod 𝑁) & ⊢ (𝐵 + 1) = 𝐸 & ⊢ ((𝐷 · 𝑁) + 𝑀) = (𝐾 · 𝐴) ⇒ ⊢ ((𝐴↑𝐸) mod 𝑁) = (𝑀 mod 𝑁) | ||
Theorem | mod2xnegi 15613 | Version of mod2xi 15611 with a negative mod value. (Contributed by Mario Carneiro, 21-Feb-2014.) |
⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℤ & ⊢ 𝐾 ∈ ℕ & ⊢ 𝑀 ∈ ℕ0 & ⊢ 𝐿 ∈ ℕ0 & ⊢ ((𝐴↑𝐵) mod 𝑁) = (𝐿 mod 𝑁) & ⊢ (2 · 𝐵) = 𝐸 & ⊢ (𝐿 + 𝐾) = 𝑁 & ⊢ ((𝐷 · 𝑁) + 𝑀) = (𝐾 · 𝐾) ⇒ ⊢ ((𝐴↑𝐸) mod 𝑁) = (𝑀 mod 𝑁) | ||
Theorem | modsubi 15614 | Subtract from within a mod calculation. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ 𝑁 ∈ ℕ & ⊢ 𝐴 ∈ ℕ & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝐴 mod 𝑁) = (𝐾 mod 𝑁) & ⊢ (𝑀 + 𝐵) = 𝐾 ⇒ ⊢ ((𝐴 − 𝐵) mod 𝑁) = (𝑀 mod 𝑁) | ||
Theorem | gcdi 15615 | Calculate a GCD via Euclid's algorithm. (Contributed by Mario Carneiro, 19-Feb-2014.) |
⊢ 𝐾 ∈ ℕ0 & ⊢ 𝑅 ∈ ℕ0 & ⊢ 𝑁 ∈ ℕ0 & ⊢ (𝑁 gcd 𝑅) = 𝐺 & ⊢ ((𝐾 · 𝑁) + 𝑅) = 𝑀 ⇒ ⊢ (𝑀 gcd 𝑁) = 𝐺 | ||
Theorem | gcdmodi 15616 | Calculate a GCD via Euclid's algorithm. Theorem 5.6 in [ApostolNT] p. 109. (Contributed by Mario Carneiro, 19-Feb-2014.) |
⊢ 𝐾 ∈ ℕ0 & ⊢ 𝑅 ∈ ℕ0 & ⊢ 𝑁 ∈ ℕ & ⊢ (𝐾 mod 𝑁) = (𝑅 mod 𝑁) & ⊢ (𝑁 gcd 𝑅) = 𝐺 ⇒ ⊢ (𝐾 gcd 𝑁) = 𝐺 | ||
Theorem | decexp2 15617 | Calculate a power of two. (Contributed by Mario Carneiro, 19-Feb-2014.) |
⊢ 𝑀 ∈ ℕ0 & ⊢ (𝑀 + 2) = 𝑁 ⇒ ⊢ ((4 · (2↑𝑀)) + 0) = (2↑𝑁) | ||
Theorem | numexp0 15618 | Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ (𝐴↑0) = 1 | ||
Theorem | numexp1 15619 | Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ (𝐴↑1) = 𝐴 | ||
Theorem | numexpp1 15620 | Calculate an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝑀 + 1) = 𝑁 & ⊢ ((𝐴↑𝑀) · 𝐴) = 𝐶 ⇒ ⊢ (𝐴↑𝑁) = 𝐶 | ||
Theorem | numexp2x 15621 | Double an integer power. (Contributed by Mario Carneiro, 17-Apr-2015.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (2 · 𝑀) = 𝑁 & ⊢ (𝐴↑𝑀) = 𝐷 & ⊢ (𝐷 · 𝐷) = 𝐶 ⇒ ⊢ (𝐴↑𝑁) = 𝐶 | ||
Theorem | decsplit0b 15622 | Split a decimal number into two parts. Base case: 𝑁 = 0. (Contributed by Mario Carneiro, 16-Jul-2015.) (Revised by AV, 8-Sep-2021.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (;10↑0)) + 𝐵) = (𝐴 + 𝐵) | ||
Theorem | decsplit0 15623 | Split a decimal number into two parts. Base case: 𝑁 = 0. (Contributed by Mario Carneiro, 16-Jul-2015.) (Revised by AV, 8-Sep-2021.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (;10↑0)) + 0) = 𝐴 | ||
Theorem | decsplit1 15624 | Split a decimal number into two parts. Base case: 𝑁 = 1. (Contributed by Mario Carneiro, 16-Jul-2015.) (Revised by AV, 8-Sep-2021.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (;10↑1)) + 𝐵) = ;𝐴𝐵 | ||
Theorem | decsplit 15625 | Split a decimal number into two parts. Inductive step. (Contributed by Mario Carneiro, 16-Jul-2015.) (Revised by AV, 8-Sep-2021.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝑀 + 1) = 𝑁 & ⊢ ((𝐴 · (;10↑𝑀)) + 𝐵) = 𝐶 ⇒ ⊢ ((𝐴 · (;10↑𝑁)) + ;𝐵𝐷) = ;𝐶𝐷 | ||
Theorem | decsplit0bOLD 15626 | Obsolete version of decsplit0b 15622 as of 9-Sep-2021. (Contributed by Mario Carneiro, 16-Jul-2015.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (10↑0)) + 𝐵) = (𝐴 + 𝐵) | ||
Theorem | decsplit0OLD 15627 | Obsolete version of decsplit0 15623 as of 9-Sep-2021. (Contributed by Mario Carneiro, 16-Jul-2015.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (10↑0)) + 0) = 𝐴 | ||
Theorem | decsplit1OLD 15628 | Obsolete version of decsplit1 15624 as of 9-Sep-2021. (Contributed by Mario Carneiro, 16-Jul-2015.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ 𝐴 ∈ ℕ0 ⇒ ⊢ ((𝐴 · (10↑1)) + 𝐵) = ;𝐴𝐵 | ||
Theorem | decsplitOLD 15629 | Obsolete version of decsplit 15625 as of 9-Sep-2021. (Contributed by Mario Carneiro, 16-Jul-2015.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐷 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝑀 + 1) = 𝑁 & ⊢ ((𝐴 · (10↑𝑀)) + 𝐵) = 𝐶 ⇒ ⊢ ((𝐴 · (10↑𝑁)) + ;𝐵𝐷) = ;𝐶𝐷 | ||
Theorem | karatsuba 15630 | The Karatsuba multiplication algorithm. If 𝑋 and 𝑌 are decomposed into two groups of digits of length 𝑀 (only the lower group is known to be this size but the algorithm is most efficient when the partition is chosen near the middle of the digit string), then 𝑋𝑌 can be written in three groups of digits, where each group needs only one multiplication. Thus, we can halve both inputs with only three multiplications on the smaller operands, yielding an asymptotic improvement of n^(log2 3) instead of n^2 for the "naive" algorithm decmul1c 11463. (Contributed by Mario Carneiro, 16-Jul-2015.) (Revised by AV, 9-Sep-2021.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐶 ∈ ℕ0 & ⊢ 𝐷 ∈ ℕ0 & ⊢ 𝑆 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝐴 · 𝐶) = 𝑅 & ⊢ (𝐵 · 𝐷) = 𝑇 & ⊢ ((𝐴 + 𝐵) · (𝐶 + 𝐷)) = ((𝑅 + 𝑆) + 𝑇) & ⊢ ((𝐴 · (;10↑𝑀)) + 𝐵) = 𝑋 & ⊢ ((𝐶 · (;10↑𝑀)) + 𝐷) = 𝑌 & ⊢ ((𝑅 · (;10↑𝑀)) + 𝑆) = 𝑊 & ⊢ ((𝑊 · (;10↑𝑀)) + 𝑇) = 𝑍 ⇒ ⊢ (𝑋 · 𝑌) = 𝑍 | ||
Theorem | karatsubaOLD 15631 | Obsolete version of karatsuba 15630 as of 9-Sep-2021. (Contributed by Mario Carneiro, 16-Jul-2015.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ 𝐴 ∈ ℕ0 & ⊢ 𝐵 ∈ ℕ0 & ⊢ 𝐶 ∈ ℕ0 & ⊢ 𝐷 ∈ ℕ0 & ⊢ 𝑆 ∈ ℕ0 & ⊢ 𝑀 ∈ ℕ0 & ⊢ (𝐴 · 𝐶) = 𝑅 & ⊢ (𝐵 · 𝐷) = 𝑇 & ⊢ ((𝐴 + 𝐵) · (𝐶 + 𝐷)) = ((𝑅 + 𝑆) + 𝑇) & ⊢ ((𝐴 · (10↑𝑀)) + 𝐵) = 𝑋 & ⊢ ((𝐶 · (10↑𝑀)) + 𝐷) = 𝑌 & ⊢ ((𝑅 · (10↑𝑀)) + 𝑆) = 𝑊 & ⊢ ((𝑊 · (10↑𝑀)) + 𝑇) = 𝑍 ⇒ ⊢ (𝑋 · 𝑌) = 𝑍 | ||
Theorem | 2exp4 15632 | Two to the fourth power is 16. (Contributed by Mario Carneiro, 20-Apr-2015.) |
⊢ (2↑4) = ;16 | ||
Theorem | 2exp6 15633 | Two to the sixth power is 64. (Contributed by Mario Carneiro, 20-Apr-2015.) (Proof shortened by OpenAI, 25-Mar-2020.) |
⊢ (2↑6) = ;64 | ||
Theorem | 2exp8 15634 | Two to the eighth power is 256. (Contributed by Mario Carneiro, 20-Apr-2015.) |
⊢ (2↑8) = ;;256 | ||
Theorem | 2exp16 15635 | Two to the sixteenth power is 65536. (Contributed by Mario Carneiro, 20-Apr-2015.) |
⊢ (2↑;16) = ;;;;65536 | ||
Theorem | 3exp3 15636 | Three to the third power is 27. (Contributed by Mario Carneiro, 20-Apr-2015.) |
⊢ (3↑3) = ;27 | ||
Theorem | 2expltfac 15637 | The factorial grows faster than two to the power 𝑁. (Contributed by Mario Carneiro, 15-Sep-2016.) |
⊢ (𝑁 ∈ (ℤ≥‘4) → (2↑𝑁) < (!‘𝑁)) | ||
Theorem | cshwsidrepsw 15638 | If cyclically shifting a word of length being a prime number by a number of positions which is not divisible by the prime number results in the word itself, the word is a "repeated symbol word". (Contributed by AV, 18-May-2018.) (Revised by AV, 10-Nov-2018.) |
⊢ ((𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ) → ((𝐿 ∈ ℤ ∧ (𝐿 mod (#‘𝑊)) ≠ 0 ∧ (𝑊 cyclShift 𝐿) = 𝑊) → 𝑊 = ((𝑊‘0) repeatS (#‘𝑊)))) | ||
Theorem | cshwsidrepswmod0 15639 | If cyclically shifting a word of length being a prime number results in the word itself, the shift must be either by 0 (modulo the length of the word) or the word must be a "repeated symbol word". (Contributed by AV, 18-May-2018.) (Revised by AV, 10-Nov-2018.) |
⊢ ((𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ ∧ 𝐿 ∈ ℤ) → ((𝑊 cyclShift 𝐿) = 𝑊 → ((𝐿 mod (#‘𝑊)) = 0 ∨ 𝑊 = ((𝑊‘0) repeatS (#‘𝑊))))) | ||
Theorem | cshwshashlem1 15640* | If cyclically shifting a word of length being a prime number not consisting of identical symbols by at least one position (and not by as many positions as the length of the word), the result will not be the word itself. (Contributed by AV, 19-May-2018.) (Revised by AV, 8-Jun-2018.) (Revised by AV, 10-Nov-2018.) |
⊢ (𝜑 → (𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ)) ⇒ ⊢ ((𝜑 ∧ ∃𝑖 ∈ (0..^(#‘𝑊))(𝑊‘𝑖) ≠ (𝑊‘0) ∧ 𝐿 ∈ (1..^(#‘𝑊))) → (𝑊 cyclShift 𝐿) ≠ 𝑊) | ||
Theorem | cshwshashlem2 15641* | If cyclically shifting a word of length being a prime number and not of identical symbols by different numbers of positions, the resulting words are different. (Contributed by Alexander van der Vekens, 19-May-2018.) (Revised by Alexander van der Vekens, 8-Jun-2018.) |
⊢ (𝜑 → (𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ)) ⇒ ⊢ ((𝜑 ∧ ∃𝑖 ∈ (0..^(#‘𝑊))(𝑊‘𝑖) ≠ (𝑊‘0)) → ((𝐿 ∈ (0..^(#‘𝑊)) ∧ 𝐾 ∈ (0..^(#‘𝑊)) ∧ 𝐾 < 𝐿) → (𝑊 cyclShift 𝐿) ≠ (𝑊 cyclShift 𝐾))) | ||
Theorem | cshwshashlem3 15642* | If cyclically shifting a word of length being a prime number and not of identical symbols by different numbers of positions, the resulting words are different. (Contributed by Alexander van der Vekens, 19-May-2018.) (Revised by Alexander van der Vekens, 8-Jun-2018.) |
⊢ (𝜑 → (𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ)) ⇒ ⊢ ((𝜑 ∧ ∃𝑖 ∈ (0..^(#‘𝑊))(𝑊‘𝑖) ≠ (𝑊‘0)) → ((𝐿 ∈ (0..^(#‘𝑊)) ∧ 𝐾 ∈ (0..^(#‘𝑊)) ∧ 𝐾 ≠ 𝐿) → (𝑊 cyclShift 𝐿) ≠ (𝑊 cyclShift 𝐾))) | ||
Theorem | cshwsdisj 15643* | The singletons resulting by cyclically shifting a given word of length being a prime number and not consisting of identical symbols is a disjoint collection. (Contributed by Alexander van der Vekens, 19-May-2018.) (Revised by Alexander van der Vekens, 8-Jun-2018.) |
⊢ (𝜑 → (𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ)) ⇒ ⊢ ((𝜑 ∧ ∃𝑖 ∈ (0..^(#‘𝑊))(𝑊‘𝑖) ≠ (𝑊‘0)) → Disj 𝑛 ∈ (0..^(#‘𝑊)){(𝑊 cyclShift 𝑛)}) | ||
Theorem | cshwsiun 15644* | The set of (different!) words resulting by cyclically shifting a given word is an indexed union. (Contributed by AV, 19-May-2018.) (Revised by AV, 8-Jun-2018.) (Proof shortened by AV, 8-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ (𝑊 ∈ Word 𝑉 → 𝑀 = ∪ 𝑛 ∈ (0..^(#‘𝑊)){(𝑊 cyclShift 𝑛)}) | ||
Theorem | cshwsex 15645* | The class of (different!) words resulting by cyclically shifting a given word is a set. (Contributed by AV, 8-Jun-2018.) (Revised by AV, 8-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ (𝑊 ∈ Word 𝑉 → 𝑀 ∈ V) | ||
Theorem | cshws0 15646* | The size of the set of (different!) words resulting by cyclically shifting an empty word is 0. (Contributed by AV, 8-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ (𝑊 = ∅ → (#‘𝑀) = 0) | ||
Theorem | cshwrepswhash1 15647* | The size of the set of (different!) words resulting by cyclically shifting a nonempty "repeated symbol word" is 1. (Contributed by AV, 18-May-2018.) (Revised by AV, 8-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ ((𝐴 ∈ 𝑉 ∧ 𝑁 ∈ ℕ ∧ 𝑊 = (𝐴 repeatS 𝑁)) → (#‘𝑀) = 1) | ||
Theorem | cshwshashnsame 15648* | If a word (not consisting of identical symbols) has a length being a prime number, the size of the set of (different!) words resulting by cyclically shifting the original word equals the length of the original word. (Contributed by AV, 19-May-2018.) (Revised by AV, 10-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ ((𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ) → (∃𝑖 ∈ (0..^(#‘𝑊))(𝑊‘𝑖) ≠ (𝑊‘0) → (#‘𝑀) = (#‘𝑊))) | ||
Theorem | cshwshash 15649* | If a word has a length being a prime number, the size of the set of (different!) words resulting by cyclically shifting the original word equals the length of the original word or 1. (Contributed by AV, 19-May-2018.) (Revised by AV, 10-Nov-2018.) |
⊢ 𝑀 = {𝑤 ∈ Word 𝑉 ∣ ∃𝑛 ∈ (0..^(#‘𝑊))(𝑊 cyclShift 𝑛) = 𝑤} ⇒ ⊢ ((𝑊 ∈ Word 𝑉 ∧ (#‘𝑊) ∈ ℙ) → ((#‘𝑀) = (#‘𝑊) ∨ (#‘𝑀) = 1)) | ||
Theorem | prmlem0 15650* | Lemma for prmlem1 15652 and prmlem2 15665. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ ((¬ 2 ∥ 𝑀 ∧ 𝑥 ∈ (ℤ≥‘𝑀)) → ((𝑥 ∈ (ℙ ∖ {2}) ∧ (𝑥↑2) ≤ 𝑁) → ¬ 𝑥 ∥ 𝑁)) & ⊢ (𝐾 ∈ ℙ → ¬ 𝐾 ∥ 𝑁) & ⊢ (𝐾 + 2) = 𝑀 ⇒ ⊢ ((¬ 2 ∥ 𝐾 ∧ 𝑥 ∈ (ℤ≥‘𝐾)) → ((𝑥 ∈ (ℙ ∖ {2}) ∧ (𝑥↑2) ≤ 𝑁) → ¬ 𝑥 ∥ 𝑁)) | ||
Theorem | prmlem1a 15651* | A quick proof skeleton to show that the numbers less than 25 are prime, by trial division. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ 𝑁 ∈ ℕ & ⊢ 1 < 𝑁 & ⊢ ¬ 2 ∥ 𝑁 & ⊢ ¬ 3 ∥ 𝑁 & ⊢ ((¬ 2 ∥ 5 ∧ 𝑥 ∈ (ℤ≥‘5)) → ((𝑥 ∈ (ℙ ∖ {2}) ∧ (𝑥↑2) ≤ 𝑁) → ¬ 𝑥 ∥ 𝑁)) ⇒ ⊢ 𝑁 ∈ ℙ | ||
Theorem | prmlem1 15652 | A quick proof skeleton to show that the numbers less than 25 are prime, by trial division. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ 𝑁 ∈ ℕ & ⊢ 1 < 𝑁 & ⊢ ¬ 2 ∥ 𝑁 & ⊢ ¬ 3 ∥ 𝑁 & ⊢ 𝑁 < ;25 ⇒ ⊢ 𝑁 ∈ ℙ | ||
Theorem | 5prm 15653 | 5 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ 5 ∈ ℙ | ||
Theorem | 6nprm 15654 | 6 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ ¬ 6 ∈ ℙ | ||
Theorem | 7prm 15655 | 7 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ 7 ∈ ℙ | ||
Theorem | 8nprm 15656 | 8 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ ¬ 8 ∈ ℙ | ||
Theorem | 9nprm 15657 | 9 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) |
⊢ ¬ 9 ∈ ℙ | ||
Theorem | 10nprm 15658 | 10 is not a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by AV, 6-Sep-2021.) |
⊢ ¬ ;10 ∈ ℙ | ||
Theorem | 10nprmOLD 15659 | Obsolete version of 10nprm 15658 as of 6-Sep-2021. (Contributed by Mario Carneiro, 18-Feb-2014.) (New usage is discouraged.) (Proof modification is discouraged.) |
⊢ ¬ 10 ∈ ℙ | ||
Theorem | 11prm 15660 | 11 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ ;11 ∈ ℙ | ||
Theorem | 13prm 15661 | 13 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ ;13 ∈ ℙ | ||
Theorem | 17prm 15662 | 17 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ ;17 ∈ ℙ | ||
Theorem | 19prm 15663 | 19 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ ;19 ∈ ℙ | ||
Theorem | 23prm 15664 | 23 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ ;23 ∈ ℙ | ||
Theorem | prmlem2 15665 |
Our last proving session got as far as 25 because we started with the
two "bootstrap" primes 2 and 3, and the next prime is 5, so
knowing that
2 and 3 are prime and 4 is not allows us to cover the numbers less than
5↑2 = 25. Additionally, nonprimes are
"easy", so we can extend
this range of known prime/nonprimes all the way until 29, which is the
first prime larger than 25. Thus, in this lemma we extend another
blanket out to 29↑2 = 841, from which we
can prove even more
primes. If we wanted, we could keep doing this, but the goal is
Bertrand's postulate, and for that we only need a few large primes - we
don't need to find them all, as we have been doing thus far. So after
this blanket runs out, we'll have to switch to another method (see
1259prm 15681).
As a side note, you can see the pattern of the primes in the indentation pattern of this lemma! (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ 𝑁 ∈ ℕ & ⊢ 𝑁 < ;;841 & ⊢ 1 < 𝑁 & ⊢ ¬ 2 ∥ 𝑁 & ⊢ ¬ 3 ∥ 𝑁 & ⊢ ¬ 5 ∥ 𝑁 & ⊢ ¬ 7 ∥ 𝑁 & ⊢ ¬ ;11 ∥ 𝑁 & ⊢ ¬ ;13 ∥ 𝑁 & ⊢ ¬ ;17 ∥ 𝑁 & ⊢ ¬ ;19 ∥ 𝑁 & ⊢ ¬ ;23 ∥ 𝑁 ⇒ ⊢ 𝑁 ∈ ℙ | ||
Theorem | 37prm 15666 | 37 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;37 ∈ ℙ | ||
Theorem | 43prm 15667 | 43 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;43 ∈ ℙ | ||
Theorem | 83prm 15668 | 83 is a prime number. (Contributed by Mario Carneiro, 18-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;83 ∈ ℙ | ||
Theorem | 139prm 15669 | 139 is a prime number. (Contributed by Mario Carneiro, 19-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;;139 ∈ ℙ | ||
Theorem | 163prm 15670 | 163 is a prime number. (Contributed by Mario Carneiro, 19-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;;163 ∈ ℙ | ||
Theorem | 317prm 15671 | 317 is a prime number. (Contributed by Mario Carneiro, 19-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;;317 ∈ ℙ | ||
Theorem | 631prm 15672 | 631 is a prime number. (Contributed by Mario Carneiro, 1-Mar-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ ;;631 ∈ ℙ | ||
Theorem | prmo4 15673 | The primorial of 4. (Contributed by AV, 28-Aug-2020.) |
⊢ (#p‘4) = 6 | ||
Theorem | prmo5 15674 | The primorial of 5. (Contributed by AV, 28-Aug-2020.) |
⊢ (#p‘5) = ;30 | ||
Theorem | prmo6 15675 | The primorial of 6. (Contributed by AV, 28-Aug-2020.) |
⊢ (#p‘6) = ;30 | ||
Theorem | 1259lem1 15676 | Lemma for 1259prm 15681. Calculate a power mod. In decimal, we calculate 2↑16 = 52𝑁 + 68≡68 and 2↑17≡68 · 2 = 136 in this lemma. (Contributed by Mario Carneiro, 22-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ ((2↑;17) mod 𝑁) = (;;136 mod 𝑁) | ||
Theorem | 1259lem2 15677 | Lemma for 1259prm 15681. Calculate a power mod. In decimal, we calculate 2↑34 = (2↑17)↑2≡136↑2≡14𝑁 + 870. (Contributed by Mario Carneiro, 22-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 15-Sep-2021.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ ((2↑;34) mod 𝑁) = (;;870 mod 𝑁) | ||
Theorem | 1259lem3 15678 | Lemma for 1259prm 15681. Calculate a power mod. In decimal, we calculate 2↑38 = 2↑34 · 2↑4≡870 · 16 = 11𝑁 + 71 and 2↑76 = (2↑34)↑2≡71↑2 = 4𝑁 + 5≡5. (Contributed by Mario Carneiro, 22-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ ((2↑;76) mod 𝑁) = (5 mod 𝑁) | ||
Theorem | 1259lem4 15679 | Lemma for 1259prm 15681. Calculate a power mod. In decimal, we calculate 2↑306 = (2↑76)↑4 · 4≡5↑4 · 4 = 2𝑁 − 18, 2↑612 = (2↑306)↑2≡18↑2 = 324, 2↑629 = 2↑612 · 2↑17≡324 · 136 = 35𝑁 − 1 and finally 2↑(𝑁 − 1) = (2↑629)↑2≡1↑2 = 1. (Contributed by Mario Carneiro, 22-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ ((2↑(𝑁 − 1)) mod 𝑁) = (1 mod 𝑁) | ||
Theorem | 1259lem5 15680 | Lemma for 1259prm 15681. Calculate the GCD of 2↑34 − 1≡869 with 𝑁 = 1259. (Contributed by Mario Carneiro, 22-Feb-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ (((2↑;34) − 1) gcd 𝑁) = 1 | ||
Theorem | 1259prm 15681 | 1259 is a prime number. (Contributed by Mario Carneiro, 22-Feb-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ 𝑁 = ;;;1259 ⇒ ⊢ 𝑁 ∈ ℙ | ||
Theorem | 2503lem1 15682 | Lemma for 2503prm 15685. Calculate a power mod. In decimal, we calculate 2↑18 = 512↑2 = 104𝑁 + 1832≡1832. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;2503 ⇒ ⊢ ((2↑;18) mod 𝑁) = (;;;1832 mod 𝑁) | ||
Theorem | 2503lem2 15683 | Lemma for 2503prm 15685. Calculate a power mod. We calculate 2↑19 = 2↑18 · 2≡1832 · 2 = 𝑁 + 1161, 2↑38 = (2↑19)↑2≡1161↑2 = 538𝑁 + 1307, 2↑39 = 2↑38 · 2≡1307 · 2 = 𝑁 + 111, 2↑78 = (2↑39)↑2≡111↑2 = 5𝑁 − 194, 2↑156 = (2↑78)↑2≡194↑2 = 15𝑁 + 91, 2↑312 = (2↑156)↑2≡91↑2 = 3𝑁 + 772, 2↑624 = (2↑312)↑2≡772↑2 = 238𝑁 + 270, 2↑1248 = (2↑624)↑2≡270↑2 = 29𝑁 + 313, 2↑1251 = 2↑1248 · 8≡313 · 8 = 𝑁 + 1 and finally 2↑(𝑁 − 1) = (2↑1251)↑2≡1↑2 = 1. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;2503 ⇒ ⊢ ((2↑(𝑁 − 1)) mod 𝑁) = (1 mod 𝑁) | ||
Theorem | 2503lem3 15684 | Lemma for 2503prm 15685. Calculate the GCD of 2↑18 − 1≡1831 with 𝑁 = 2503. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 15-Sep-2021.) |
⊢ 𝑁 = ;;;2503 ⇒ ⊢ (((2↑;18) − 1) gcd 𝑁) = 1 | ||
Theorem | 2503prm 15685 | 2503 is a prime number. (Contributed by Mario Carneiro, 3-Mar-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) |
⊢ 𝑁 = ;;;2503 ⇒ ⊢ 𝑁 ∈ ℙ | ||
Theorem | 4001lem1 15686 | Lemma for 4001prm 15690. Calculate a power mod. In decimal, we calculate 2↑12 = 4096 = 𝑁 + 95, 2↑24 = (2↑12)↑2≡95↑2 = 2𝑁 + 1023, 2↑25 = 2↑24 · 2≡1023 · 2 = 2046, 2↑50 = (2↑25)↑2≡2046↑2 = 1046𝑁 + 1070, 2↑100 = (2↑50)↑2≡1070↑2 = 286𝑁 + 614 and 2↑200 = (2↑100)↑2≡614↑2 = 94𝑁 + 902 ≡902. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;4001 ⇒ ⊢ ((2↑;;200) mod 𝑁) = (;;902 mod 𝑁) | ||
Theorem | 4001lem2 15687 | Lemma for 4001prm 15690. Calculate a power mod. In decimal, we calculate 2↑400 = (2↑200)↑2≡902↑2 = 203𝑁 + 1401 and 2↑800 = (2↑400)↑2≡1401↑2 = 490𝑁 + 2311 ≡2311. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;4001 ⇒ ⊢ ((2↑;;800) mod 𝑁) = (;;;2311 mod 𝑁) | ||
Theorem | 4001lem3 15688 | Lemma for 4001prm 15690. Calculate a power mod. In decimal, we calculate 2↑1000 = 2↑800 · 2↑200≡2311 · 902 = 521𝑁 + 1 and finally 2↑(𝑁 − 1) = (2↑1000)↑4≡1↑4 = 1. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;4001 ⇒ ⊢ ((2↑(𝑁 − 1)) mod 𝑁) = (1 mod 𝑁) | ||
Theorem | 4001lem4 15689 | Lemma for 4001prm 15690. Calculate the GCD of 2↑800 − 1≡2310 with 𝑁 = 4001. (Contributed by Mario Carneiro, 3-Mar-2014.) (Revised by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;4001 ⇒ ⊢ (((2↑;;800) − 1) gcd 𝑁) = 1 | ||
Theorem | 4001prm 15690 | 4001 is a prime number. (Contributed by Mario Carneiro, 3-Mar-2014.) (Proof shortened by Mario Carneiro, 20-Apr-2015.) (Proof shortened by AV, 16-Sep-2021.) |
⊢ 𝑁 = ;;;4001 ⇒ ⊢ 𝑁 ∈ ℙ | ||
An "extensible structure" is used to define a specific group, ring, poset, and so on. An extensible structure can contain many components. For example, a group will have at least two components (base set and operation), although it can be further specialized by adding other components such as a multiplicative operation for rings (and still remain a group per our definition). Thus, every ring is also a group. This extensible structure approach allows theorems from more general structures (such as groups) to be reused for more specialized structures (such as rings) without having to reprove anything. Structures are common in mathematics, but in informal (natural language) proofs the details are assumed in ways that we must make explicit. An extensible structure is implemented as a function (a set of ordered pairs) on a finite (and not necessarily sequential) subset of ℕ. The function's argument is the index of a structure component (such as 1 for the base set of a group), and its value is the component (such as the base set). By convention, we normally avoid direct reference to the hard-coded numeric index and instead use structure component extractors such as ndxid 15716 and strfv 15735. Using extractors makes it easier to change numeric indices and also makes the components' purpose clearer. For example, as noted in ndxid 15716, we can refer to a specific poset with base set 𝐵 and order relation 𝐿 using the extensible structure {〈(Base‘ndx), 𝐵〉, 〈(le‘ndx), 𝐿〉} rather than {〈1, 𝐵〉, 〈;10, 𝐿〉}. There are many other possible ways to handle structures. We chose this extensible structure approach because this approach (1) results in simpler notation than other approaches we are aware of, and (2) is easier to do proofs with. We cannot use an approach that uses "hidden" arguments; Metamath does not support hidden arguments, and in any case we want nothing hidden. It would be possible to use a categorical approach (e.g., something vaguely similar to Lean's mathlib). However, instances (the chain of proofs that an 𝑋 is a 𝑌 via a bunch of forgetful functors) can cause serious performance problems for automated tooling, and the resulting proofs would be painful to look at directly (in the case of Lean, they are long past the level where people would find it acceptable to look at them directly). Metamath is working under much stricter conditions than this, and it has still managed to achieve about the same level of flexibility through this "extensible structure" approach. To create a substructure of a given extensible structure, you can simply use the multifunction restriction operator for extensible structures ↾s as defined in df-ress 15702. This can be used to turn statements about rings into statements about subrings, modules into submodules, etc. This definition knows nothing about individual structures and merely truncates the Base set while leaving operators alone. Individual kinds of structures will need to handle this behavior by ignoring operators' values outside the range (like Ring), defining a function using the base set and applying that (like TopGrp), or explicitly truncating the slot before use (like MetSp). For example, the unital ring of integers ℤring is defined in df-zring 19638 as simply ℤring = (ℂfld ↾s ℤ). This can be similarly done for all other subsets of ℂ, which has all the structure we can show applies to it, and this all comes "for free". Should we come up with some new structure in the future that we wish ℂ to inherit, then we change the definition of ℂfld, reprove all the slot extraction theorems, add a new one, and that's it. None of the other downstream theorems have to change. Note that the construct of df-prds 15931 addresses a different situation. It is not possible to have SubGroup and SubRing be the same thing because they produce different outputs on the same input. The subgroups of an extensible structure treated as a group are not the same as the subrings of that same structure. With df-prds 15931 it can actually reasonably perform the task, that is, being the product group given a family of groups, while also being the product ring given a family of rings. There is no contradiction here because the group part of a product ring is a product group. There is also a general theory of "substructure algebras", in the form of df-mre 16069 and df-acs 16072. SubGroup is a Moore collection, as is SubRing, SubRng and many other substructure collections. But it is not useful for picking out a particular collection of interest; SubRing and SubGroup still need to be defined and they are distinct --- nothing is going to select these definitions for us. Extensible structures only work well when they represent concrete categories, where there is a "base set", homs are functions, and subobjects are subsets with induced operations. In short, they primarily work well for "sets with (some) extra structure". Extensible structures may not suffice for more complicated situations. For example, in manifolds, ↾s would not work. That said, extensible structures are sufficient for many of the structures that set.mm currently considers, and offer a good compromise for a goal-oriented formalization. | ||
Syntax | cstr 15691 | Extend class notation with the class of structures with components numbered below 𝐴. |
class Struct | ||
Syntax | cnx 15692 | Extend class notation with the structure component index extractor. |
class ndx | ||
Syntax | csts 15693 | Set components of a structure. |
class sSet | ||
Syntax | cslot 15694 | Extend class notation with the slot function. |
class Slot 𝐴 | ||
Syntax | cbs 15695 | Extend class notation with the class of all base set extractors. |
class Base | ||
Syntax | cress 15696 | Extend class notation with the extensible structure builder restriction operator. |
class ↾s | ||
Definition | df-struct 15697* | Define a structure with components in 𝑀...𝑁. This is not a requirement for groups, posets, etc., but it is a useful assumption for component extraction theorems. (Contributed by Mario Carneiro, 29-Aug-2015.) |
⊢ Struct = {〈𝑓, 𝑥〉 ∣ (𝑥 ∈ ( ≤ ∩ (ℕ × ℕ)) ∧ Fun (𝑓 ∖ {∅}) ∧ dom 𝑓 ⊆ (...‘𝑥))} | ||
Definition | df-ndx 15698 | Define the structure component index extractor. See theorem ndxarg 15715 to understand its purpose. The restriction to ℕ allows ndx to exist as a set, since I is a proper class. In principle, we could have chosen ℂ or (if we revise all structure component definitions such as df-base 15700) another set such as the natural ordinal numbers ω (df-om 6958). (Contributed by NM, 4-Sep-2011.) |
⊢ ndx = ( I ↾ ℕ) | ||
Definition | df-slot 15699* | Define slot extractor for posets and related structures. Note that the function argument can be any set, although it is meaningful only if it is a member of Poset (df-poset 16769) when used for posets or of Grp (df-grp 17248) when used from groups. (Contributed by Mario Carneiro, 22-Sep-2015.) |
⊢ Slot 𝐴 = (𝑥 ∈ V ↦ (𝑥‘𝐴)) | ||
Definition | df-base 15700 | Define the base set (also called underlying set or carrier set) extractor for posets and related structures. (Contributed by NM, 4-Sep-2011.) (Revised by Mario Carneiro, 14-Aug-2015.) |
⊢ Base = Slot 1 |
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