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Mirrors > Home > MPE Home > Th. List > z2ge | Structured version Visualization version GIF version |
Description: There exists an integer greater than or equal to any two others. (Contributed by NM, 28-Aug-2005.) |
Ref | Expression |
---|---|
z2ge | ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ∃𝑘 ∈ ℤ (𝑀 ≤ 𝑘 ∧ 𝑁 ≤ 𝑘)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ifcl 4080 | . . 3 ⊢ ((𝑁 ∈ ℤ ∧ 𝑀 ∈ ℤ) → if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∈ ℤ) | |
2 | 1 | ancoms 468 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∈ ℤ) |
3 | zre 11258 | . . 3 ⊢ (𝑀 ∈ ℤ → 𝑀 ∈ ℝ) | |
4 | zre 11258 | . . 3 ⊢ (𝑁 ∈ ℤ → 𝑁 ∈ ℝ) | |
5 | max1 11890 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → 𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀)) | |
6 | max2 11892 | . . . 4 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀)) | |
7 | 5, 6 | jca 553 | . . 3 ⊢ ((𝑀 ∈ ℝ ∧ 𝑁 ∈ ℝ) → (𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∧ 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀))) |
8 | 3, 4, 7 | syl2an 493 | . 2 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → (𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∧ 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀))) |
9 | breq2 4587 | . . . 4 ⊢ (𝑘 = if(𝑀 ≤ 𝑁, 𝑁, 𝑀) → (𝑀 ≤ 𝑘 ↔ 𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀))) | |
10 | breq2 4587 | . . . 4 ⊢ (𝑘 = if(𝑀 ≤ 𝑁, 𝑁, 𝑀) → (𝑁 ≤ 𝑘 ↔ 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀))) | |
11 | 9, 10 | anbi12d 743 | . . 3 ⊢ (𝑘 = if(𝑀 ≤ 𝑁, 𝑁, 𝑀) → ((𝑀 ≤ 𝑘 ∧ 𝑁 ≤ 𝑘) ↔ (𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∧ 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀)))) |
12 | 11 | rspcev 3282 | . 2 ⊢ ((if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∈ ℤ ∧ (𝑀 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀) ∧ 𝑁 ≤ if(𝑀 ≤ 𝑁, 𝑁, 𝑀))) → ∃𝑘 ∈ ℤ (𝑀 ≤ 𝑘 ∧ 𝑁 ≤ 𝑘)) |
13 | 2, 8, 12 | syl2anc 691 | 1 ⊢ ((𝑀 ∈ ℤ ∧ 𝑁 ∈ ℤ) → ∃𝑘 ∈ ℤ (𝑀 ≤ 𝑘 ∧ 𝑁 ≤ 𝑘)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 383 = wceq 1475 ∈ wcel 1977 ∃wrex 2897 ifcif 4036 class class class wbr 4583 ℝcr 9814 ≤ cle 9954 ℤcz 11254 |
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-pre-lttri 9889 ax-pre-lttrn 9890 |
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-rab 2905 df-v 3175 df-sbc 3403 df-csb 3500 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-nul 3875 df-if 4037 df-pw 4110 df-sn 4126 df-pr 4128 df-op 4132 df-uni 4373 df-br 4584 df-opab 4644 df-mpt 4645 df-id 4953 df-po 4959 df-so 4960 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-iota 5768 df-fun 5806 df-fn 5807 df-f 5808 df-f1 5809 df-fo 5810 df-f1o 5811 df-fv 5812 df-ov 6552 df-er 7629 df-en 7842 df-dom 7843 df-sdom 7844 df-pnf 9955 df-mnf 9956 df-xr 9957 df-ltxr 9958 df-le 9959 df-neg 10148 df-z 11255 |
This theorem is referenced by: (None) |
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