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Mathbox for Alexander van der Vekens |
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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 12678 | . . . . . . 7 ⊢ ¬ (1 / 2) ∈ ℤ | |
2 | eleq1a 2824 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → ((1 / 2) = 𝑥 → (1 / 2) ∈ ℤ)) | |
3 | 1, 2 | mtoi 198 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → ¬ (1 / 2) = 𝑥) |
4 | 1cnd 11247 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → 1 ∈ ℂ) | |
5 | zcn 12601 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
6 | 2cnne0 12460 | . . . . . . . 8 ⊢ (2 ∈ ℂ ∧ 2 ≠ 0) | |
7 | 6 | a1i 11 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ → (2 ∈ ℂ ∧ 2 ≠ 0)) |
8 | divmul2 11914 | . . . . . . 7 ⊢ ((1 ∈ ℂ ∧ 𝑥 ∈ ℂ ∧ (2 ∈ ℂ ∧ 2 ≠ 0)) → ((1 / 2) = 𝑥 ↔ 1 = (2 · 𝑥))) | |
9 | 4, 5, 7, 8 | syl3anc 1368 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → ((1 / 2) = 𝑥 ↔ 1 = (2 · 𝑥))) |
10 | 3, 9 | mtbid 323 | . . . . 5 ⊢ (𝑥 ∈ ℤ → ¬ 1 = (2 · 𝑥)) |
11 | 10 | nrex 3071 | . . . 4 ⊢ ¬ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥) |
12 | 11 | intnan 485 | . . 3 ⊢ ¬ (1 ∈ ℤ ∧ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥)) |
13 | eqeq1 2732 | . . . . 5 ⊢ (𝑧 = 1 → (𝑧 = (2 · 𝑥) ↔ 1 = (2 · 𝑥))) | |
14 | 13 | rexbidv 3176 | . . . 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 3687 | . . 3 ⊢ (1 ∈ 𝐸 ↔ (1 ∈ ℤ ∧ ∃𝑥 ∈ ℤ 1 = (2 · 𝑥))) |
17 | 12, 16 | mtbir 322 | . 2 ⊢ ¬ 1 ∈ 𝐸 |
18 | 17 | nelir 3046 | 1 ⊢ 1 ∉ 𝐸 |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∧ wa 394 = wceq 1533 ∈ wcel 2098 ≠ wne 2937 ∉ wnel 3043 ∃wrex 3067 {crab 3430 (class class class)co 7426 ℂcc 11144 0cc0 11146 1c1 11147 · cmul 11151 / cdiv 11909 2c2 12305 ℤcz 12596 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1789 ax-4 1803 ax-5 1905 ax-6 1963 ax-7 2003 ax-8 2100 ax-9 2108 ax-10 2129 ax-11 2146 ax-12 2166 ax-ext 2699 ax-sep 5303 ax-nul 5310 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-resscn 11203 ax-1cn 11204 ax-icn 11205 ax-addcl 11206 ax-addrcl 11207 ax-mulcl 11208 ax-mulrcl 11209 ax-mulcom 11210 ax-addass 11211 ax-mulass 11212 ax-distr 11213 ax-i2m1 11214 ax-1ne0 11215 ax-1rid 11216 ax-rnegex 11217 ax-rrecex 11218 ax-cnre 11219 ax-pre-lttri 11220 ax-pre-lttrn 11221 ax-pre-ltadd 11222 ax-pre-mulgt0 11223 |
This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1536 df-fal 1546 df-ex 1774 df-nf 1778 df-sb 2060 df-mo 2529 df-eu 2558 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2938 df-nel 3044 df-ral 3059 df-rex 3068 df-rmo 3374 df-reu 3375 df-rab 3431 df-v 3475 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4327 df-if 4533 df-pw 4608 df-sn 4633 df-pr 4635 df-op 4639 df-uni 4913 df-iun 5002 df-br 5153 df-opab 5215 df-mpt 5236 df-tr 5270 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6310 df-ord 6377 df-on 6378 df-lim 6379 df-suc 6380 df-iota 6505 df-fun 6555 df-fn 6556 df-f 6557 df-f1 6558 df-fo 6559 df-f1o 6560 df-fv 6561 df-riota 7382 df-ov 7429 df-oprab 7430 df-mpo 7431 df-om 7877 df-2nd 8000 df-frecs 8293 df-wrecs 8324 df-recs 8398 df-rdg 8437 df-er 8731 df-en 8971 df-dom 8972 df-sdom 8973 df-pnf 11288 df-mnf 11289 df-xr 11290 df-ltxr 11291 df-le 11292 df-sub 11484 df-neg 11485 df-div 11910 df-nn 12251 df-2 12313 df-n0 12511 df-z 12597 |
This theorem is referenced by: 2zrngnmlid 47395 2zrngnmrid 47396 |
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