| Mathbox for Alexander van der Vekens |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > 1odd | Structured version Visualization version GIF version | ||
| Description: 1 is an odd integer. (Contributed by AV, 3-Feb-2020.) |
| Ref | Expression |
|---|---|
| oddinmgm.e | ⊢ 𝑂 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = ((2 · 𝑥) + 1)} |
| Ref | Expression |
|---|---|
| 1odd | ⊢ 1 ∈ 𝑂 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 1z 12615 | . 2 ⊢ 1 ∈ ℤ | |
| 2 | 0z 12593 | . . 3 ⊢ 0 ∈ ℤ | |
| 3 | id 23 | . . . 4 ⊢ (0 ∈ ℤ → 0 ∈ ℤ) | |
| 4 | oveq2 7408 | . . . . . . . 8 ⊢ (𝑥 = 0 → (2 · 𝑥) = (2 · 0)) | |
| 5 | 2t0e0 12402 | . . . . . . . 8 ⊢ (2 · 0) = 0 | |
| 6 | 4, 5 | eqtrdi 2816 | . . . . . . 7 ⊢ (𝑥 = 0 → (2 · 𝑥) = 0) |
| 7 | 6 | oveq1d 7415 | . . . . . 6 ⊢ (𝑥 = 0 → ((2 · 𝑥) + 1) = (0 + 1)) |
| 8 | 7 | eqeq2d 2776 | . . . . 5 ⊢ (𝑥 = 0 → (1 = ((2 · 𝑥) + 1) ↔ 1 = (0 + 1))) |
| 9 | 8 | adantl 486 | . . . 4 ⊢ ((0 ∈ ℤ ∧ 𝑥 = 0) → (1 = ((2 · 𝑥) + 1) ↔ 1 = (0 + 1))) |
| 10 | 1e0p1 12749 | . . . . 5 ⊢ 1 = (0 + 1) | |
| 11 | 10 | a1i 11 | . . . 4 ⊢ (0 ∈ ℤ → 1 = (0 + 1)) |
| 12 | 3, 9, 11 | rspcedvd 3586 | . . 3 ⊢ (0 ∈ ℤ → ∃𝑥 ∈ ℤ 1 = ((2 · 𝑥) + 1)) |
| 13 | 2, 12 | ax-mp 5 | . 2 ⊢ ∃𝑥 ∈ ℤ 1 = ((2 · 𝑥) + 1) |
| 14 | eqeq1 2769 | . . . 4 ⊢ (𝑧 = 1 → (𝑧 = ((2 · 𝑥) + 1) ↔ 1 = ((2 · 𝑥) + 1))) | |
| 15 | 14 | rexbidv 3189 | . . 3 ⊢ (𝑧 = 1 → (∃𝑥 ∈ ℤ 𝑧 = ((2 · 𝑥) + 1) ↔ ∃𝑥 ∈ ℤ 1 = ((2 · 𝑥) + 1))) |
| 16 | oddinmgm.e | . . 3 ⊢ 𝑂 = {𝑧 ∈ ℤ ∣ ∃𝑥 ∈ ℤ 𝑧 = ((2 · 𝑥) + 1)} | |
| 17 | 15, 16 | elrab2 3657 | . 2 ⊢ (1 ∈ 𝑂 ↔ (1 ∈ ℤ ∧ ∃𝑥 ∈ ℤ 1 = ((2 · 𝑥) + 1))) |
| 18 | 1, 13, 17 | mpbir2an 723 | 1 ⊢ 1 ∈ 𝑂 |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 209 = wceq 1563 ∈ wcel 2145 ∃wrex 3089 {crab 3417 (class class class)co 7400 0cc0 11088 1c1 11089 + caddc 11091 · cmul 11093 2c2 12286 ℤcz 12582 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1818 ax-4 1832 ax-5 1933 ax-6 1990 ax-7 2031 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2737 ax-sep 5251 ax-nul 5261 ax-pow 5327 ax-pr 5395 ax-un 7722 ax-resscn 11145 ax-1cn 11146 ax-icn 11147 ax-addcl 11148 ax-addrcl 11149 ax-mulcl 11150 ax-mulrcl 11151 ax-mulcom 11152 ax-addass 11153 ax-mulass 11154 ax-distr 11155 ax-i2m1 11156 ax-1ne0 11157 ax-1rid 11158 ax-rnegex 11159 ax-rrecex 11160 ax-cnre 11161 ax-pre-lttri 11162 ax-pre-lttrn 11163 ax-pre-ltadd 11164 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3or 1102 df-3an 1103 df-tru 1566 df-fal 1576 df-ex 1803 df-nf 1807 df-sb 2094 df-mo 2569 df-eu 2599 df-clab 2744 df-cleq 2757 df-clel 2840 df-nfc 2914 df-ne 2961 df-nel 3065 df-ral 3080 df-rex 3090 df-reu 3371 df-rab 3418 df-v 3459 df-sbc 3748 df-csb 3856 df-dif 3910 df-un 3912 df-in 3914 df-ss 3924 df-pss 3927 df-nul 4289 df-if 4484 df-pw 4560 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4869 df-iun 4954 df-br 5106 df-opab 5168 df-mpt 5187 df-tr 5213 df-id 5547 df-eprel 5552 df-po 5560 df-so 5561 df-fr 5605 df-we 5607 df-xp 5658 df-rel 5659 df-cnv 5660 df-co 5661 df-dm 5662 df-rn 5663 df-res 5664 df-ima 5665 df-pred 6292 df-ord 6353 df-on 6354 df-lim 6355 df-suc 6356 df-iota 6481 df-fun 6527 df-fn 6528 df-f 6529 df-f1 6530 df-fo 6531 df-f1o 6532 df-fv 6533 df-ov 7403 df-om 7851 df-2nd 7975 df-frecs 8266 df-wrecs 8297 df-recs 8346 df-rdg 8385 df-er 8682 df-en 8932 df-dom 8933 df-sdom 8934 df-pnf 11233 df-mnf 11234 df-ltxr 11236 df-neg 11432 df-nn 12225 df-2 12294 df-z 12583 |
| This theorem is referenced by: oddinmgm 48795 |
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