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Mirrors > Home > MPE Home > Th. List > eucalgf | Structured version Visualization version GIF version |
Description: Domain and codomain of the step function 𝐸 for Euclid's Algorithm. (Contributed by Paul Chapman, 31-Mar-2011.) (Revised by Mario Carneiro, 28-May-2014.) |
Ref | Expression |
---|---|
eucalgval.1 | ⊢ 𝐸 = (𝑥 ∈ ℕ0, 𝑦 ∈ ℕ0 ↦ if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉)) |
Ref | Expression |
---|---|
eucalgf | ⊢ 𝐸:(ℕ0 × ℕ0)⟶(ℕ0 × ℕ0) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | nnne0 10930 | . . . . . . . . 9 ⊢ (𝑦 ∈ ℕ → 𝑦 ≠ 0) | |
2 | 1 | adantl 481 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → 𝑦 ≠ 0) |
3 | 2 | neneqd 2787 | . . . . . . 7 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → ¬ 𝑦 = 0) |
4 | 3 | iffalsed 4047 | . . . . . 6 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) = 〈𝑦, (𝑥 mod 𝑦)〉) |
5 | nnnn0 11176 | . . . . . . . 8 ⊢ (𝑦 ∈ ℕ → 𝑦 ∈ ℕ0) | |
6 | 5 | adantl 481 | . . . . . . 7 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → 𝑦 ∈ ℕ0) |
7 | nn0z 11277 | . . . . . . . 8 ⊢ (𝑥 ∈ ℕ0 → 𝑥 ∈ ℤ) | |
8 | zmodcl 12552 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 ∈ ℕ) → (𝑥 mod 𝑦) ∈ ℕ0) | |
9 | 7, 8 | sylan 487 | . . . . . . 7 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → (𝑥 mod 𝑦) ∈ ℕ0) |
10 | opelxpi 5072 | . . . . . . 7 ⊢ ((𝑦 ∈ ℕ0 ∧ (𝑥 mod 𝑦) ∈ ℕ0) → 〈𝑦, (𝑥 mod 𝑦)〉 ∈ (ℕ0 × ℕ0)) | |
11 | 6, 9, 10 | syl2anc 691 | . . . . . 6 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → 〈𝑦, (𝑥 mod 𝑦)〉 ∈ (ℕ0 × ℕ0)) |
12 | 4, 11 | eqeltrd 2688 | . . . . 5 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0)) |
13 | 12 | adantlr 747 | . . . 4 ⊢ (((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) ∧ 𝑦 ∈ ℕ) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0)) |
14 | iftrue 4042 | . . . . . 6 ⊢ (𝑦 = 0 → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) = 〈𝑥, 𝑦〉) | |
15 | 14 | adantl 481 | . . . . 5 ⊢ (((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) ∧ 𝑦 = 0) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) = 〈𝑥, 𝑦〉) |
16 | opelxpi 5072 | . . . . . 6 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) → 〈𝑥, 𝑦〉 ∈ (ℕ0 × ℕ0)) | |
17 | 16 | adantr 480 | . . . . 5 ⊢ (((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) ∧ 𝑦 = 0) → 〈𝑥, 𝑦〉 ∈ (ℕ0 × ℕ0)) |
18 | 15, 17 | eqeltrd 2688 | . . . 4 ⊢ (((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) ∧ 𝑦 = 0) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0)) |
19 | simpr 476 | . . . . 5 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) → 𝑦 ∈ ℕ0) | |
20 | elnn0 11171 | . . . . 5 ⊢ (𝑦 ∈ ℕ0 ↔ (𝑦 ∈ ℕ ∨ 𝑦 = 0)) | |
21 | 19, 20 | sylib 207 | . . . 4 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) → (𝑦 ∈ ℕ ∨ 𝑦 = 0)) |
22 | 13, 18, 21 | mpjaodan 823 | . . 3 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝑦 ∈ ℕ0) → if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0)) |
23 | 22 | rgen2a 2960 | . 2 ⊢ ∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0) |
24 | eucalgval.1 | . . 3 ⊢ 𝐸 = (𝑥 ∈ ℕ0, 𝑦 ∈ ℕ0 ↦ if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉)) | |
25 | 24 | fmpt2 7126 | . 2 ⊢ (∀𝑥 ∈ ℕ0 ∀𝑦 ∈ ℕ0 if(𝑦 = 0, 〈𝑥, 𝑦〉, 〈𝑦, (𝑥 mod 𝑦)〉) ∈ (ℕ0 × ℕ0) ↔ 𝐸:(ℕ0 × ℕ0)⟶(ℕ0 × ℕ0)) |
26 | 23, 25 | mpbi 219 | 1 ⊢ 𝐸:(ℕ0 × ℕ0)⟶(ℕ0 × ℕ0) |
Colors of variables: wff setvar class |
Syntax hints: ∨ wo 382 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ≠ wne 2780 ∀wral 2896 ifcif 4036 〈cop 4131 × cxp 5036 ⟶wf 5800 (class class class)co 6549 ↦ cmpt2 6551 0cc0 9815 ℕcn 10897 ℕ0cn0 11169 ℤcz 11254 mod cmo 12530 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-8 1979 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pow 4769 ax-pr 4833 ax-un 6847 ax-cnex 9871 ax-resscn 9872 ax-1cn 9873 ax-icn 9874 ax-addcl 9875 ax-addrcl 9876 ax-mulcl 9877 ax-mulrcl 9878 ax-mulcom 9879 ax-addass 9880 ax-mulass 9881 ax-distr 9882 ax-i2m1 9883 ax-1ne0 9884 ax-1rid 9885 ax-rnegex 9886 ax-rrecex 9887 ax-cnre 9888 ax-pre-lttri 9889 ax-pre-lttrn 9890 ax-pre-ltadd 9891 ax-pre-mulgt0 9892 ax-pre-sup 9893 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3or 1032 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-nel 2783 df-ral 2901 df-rex 2902 df-reu 2903 df-rmo 2904 df-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-tp 4130 df-op 4132 df-uni 4373 df-iun 4457 df-br 4584 df-opab 4644 df-mpt 4645 df-tr 4681 df-eprel 4949 df-id 4953 df-po 4959 df-so 4960 df-fr 4997 df-we 4999 df-xp 5044 df-rel 5045 df-cnv 5046 df-co 5047 df-dm 5048 df-rn 5049 df-res 5050 df-ima 5051 df-pred 5597 df-ord 5643 df-on 5644 df-lim 5645 df-suc 5646 df-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-riota 6511 df-ov 6552 df-oprab 6553 df-mpt2 6554 df-om 6958 df-1st 7059 df-2nd 7060 df-wrecs 7294 df-recs 7355 df-rdg 7393 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-sup 8231 df-inf 8232 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-sub 10147 df-neg 10148 df-div 10564 df-nn 10898 df-n0 11170 df-z 11255 df-uz 11564 df-rp 11709 df-fl 12455 df-mod 12531 |
This theorem is referenced by: eucalgcvga 15137 eucalg 15138 |
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