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Mirrors > Home > MPE Home > Th. List > Mathboxes > 1neven | Structured version Visualization version GIF version |
Description: 1 is not an even integer. (Contributed by AV, 12-Feb-2020.) |
Ref | Expression |
---|---|
2zrng.e | ⊢ 𝐸 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} |
Ref | Expression |
---|---|
1neven | ⊢ 1 ∉ 𝐸 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | halfnz 12328 | . . . . . . 7 ⊢ ¬ (1 / 2) ∈ ℤ | |
2 | eleq1a 2834 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → ((1 / 2) = 𝑥 → (1 / 2) ∈ ℤ)) | |
3 | 1, 2 | mtoi 198 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → ¬ (1 / 2) = 𝑥) |
4 | 1cnd 10901 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → 1 ∈ ℂ) | |
5 | zcn 12254 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
6 | 2cnne0 12113 | . . . . . . . 8 ⊢ (2 ∈ ℂ ∧ 2 ≠ 0) | |
7 | 6 | a1i 11 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → (2 ∈ ℂ ∧ 2 ≠ 0)) |
8 | divmul2 11567 | . . . . . . 7 ⊢ ((1 ∈ ℂ ∧ 𝑥 ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) → ((1 / 2) = 𝑥 ↔ 1 = (2 · 𝑥))) | |
9 | 4, 5, 7, 8 | syl3anc 1369 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → ((1 / 2) = 𝑥 ↔ 1 = (2 · 𝑥))) |
10 | 3, 9 | mtbid 323 | . . . . 5 ⊢ (𝑥 ∈ ℤ → ¬ 1 = (2 · 𝑥)) |
11 | 10 | nrex 3196 | . . . 4 ⊢ ¬ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥) |
12 | 11 | intnan 486 | . . 3 ⊢ ¬ (1 ∈ ℤ ∧ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥)) |
13 | eqeq1 2742 | . . . . 5 ⊢ (𝑧 = 1 → (𝑧 = (2 · 𝑥) ↔ 1 = (2 · 𝑥))) | |
14 | 13 | rexbidv 3225 | . . . 4 ⊢ (𝑧 = 1 → (∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥) ↔ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥))) |
15 | 2zrng.e | . . . 4 ⊢ 𝐸 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = (2 · 𝑥)} | |
16 | 14, 15 | elrab2 3620 | . . 3 ⊢ (1 ∈ 𝐸 ↔ (1 ∈ ℤ ∧ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥))) |
17 | 12, 16 | mtbir 322 | . 2 ⊢ ¬ 1 ∈ 𝐸 |
18 | 17 | nelir 3051 | 1 ⊢ 1 ∉ 𝐸 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∧ wa 395 = wceq 1539 ∈ wcel 2108 ≠ wne 2942 ∉ wnel 3048 ∃wrex 3064 {crab 3067 (class class class)co 7255 ℂcc 10800 0cc0 10802 1c1 10803 · cmul 10807 / cdiv 11562 2c2 11958 ℤcz 12249 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-10 2139 ax-11 2156 ax-12 2173 ax-ext 2709 ax-sep 5218 ax-nul 5225 ax-pow 5283 ax-pr 5347 ax-un 7566 ax-resscn 10859 ax-1cn 10860 ax-icn 10861 ax-addcl 10862 ax-addrcl 10863 ax-mulcl 10864 ax-mulrcl 10865 ax-mulcom 10866 ax-addass 10867 ax-mulass 10868 ax-distr 10869 ax-i2m1 10870 ax-1ne0 10871 ax-1rid 10872 ax-rnegex 10873 ax-rrecex 10874 ax-cnre 10875 ax-pre-lttri 10876 ax-pre-lttrn 10877 ax-pre-ltadd 10878 ax-pre-mulgt0 10879 |
This theorem depends on definitions: df-bi 206 df-an 396 df-or 844 df-3or 1086 df-3an 1087 df-tru 1542 df-fal 1552 df-ex 1784 df-nf 1788 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2817 df-nfc 2888 df-ne 2943 df-nel 3049 df-ral 3068 df-rex 3069 df-reu 3070 df-rmo 3071 df-rab 3072 df-v 3424 df-sbc 3712 df-csb 3829 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-pss 3902 df-nul 4254 df-if 4457 df-pw 4532 df-sn 4559 df-pr 4561 df-tp 4563 df-op 4565 df-uni 4837 df-iun 4923 df-br 5071 df-opab 5133 df-mpt 5154 df-tr 5188 df-id 5480 df-eprel 5486 df-po 5494 df-so 5495 df-fr 5535 df-we 5537 df-xp 5586 df-rel 5587 df-cnv 5588 df-co 5589 df-dm 5590 df-rn 5591 df-res 5592 df-ima 5593 df-pred 6191 df-ord 6254 df-on 6255 df-lim 6256 df-suc 6257 df-iota 6376 df-fun 6420 df-fn 6421 df-f 6422 df-f1 6423 df-fo 6424 df-f1o 6425 df-fv 6426 df-riota 7212 df-ov 7258 df-oprab 7259 df-mpo 7260 df-om 7688 df-2nd 7805 df-frecs 8068 df-wrecs 8099 df-recs 8173 df-rdg 8212 df-er 8456 df-en 8692 df-dom 8693 df-sdom 8694 df-pnf 10942 df-mnf 10943 df-xr 10944 df-ltxr 10945 df-le 10946 df-sub 11137 df-neg 11138 df-div 11563 df-nn 11904 df-2 11966 df-n0 12164 df-z 12250 |
This theorem is referenced by: 2zrngnmlid 45395 2zrngnmrid 45396 |
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