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| Mirrors > Home > MPE Home > Th. List > Mathboxes > rexzrexnn0 | Structured version Visualization version GIF version | ||
| Description: Rewrite an existential quantification restricted to integers into an existential quantification restricted to naturals. (Contributed by Stefan O'Rear, 11-Oct-2014.) |
| Ref | Expression |
|---|---|
| rexzrexnn0.1 | ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) |
| rexzrexnn0.2 | ⊢ (𝑥 = -𝑦 → (𝜑 ↔ 𝜒)) |
| Ref | Expression |
|---|---|
| rexzrexnn0 | ⊢ (∃𝑥 ∈ ℤ 𝜑 ↔ ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | elznn0 12539 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ ↔ (𝑥 ∈ ℝ ∧ (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0))) | |
| 2 | 1 | simprbi 497 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0)) |
| 3 | 2 | adantr 480 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0)) |
| 4 | simpr 484 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → 𝑥 ∈ ℕ0) | |
| 5 | simplr 769 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → 𝜑) | |
| 6 | rexzrexnn0.1 | . . . . . . . . . . 11 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
| 7 | 6 | equcoms 2022 | . . . . . . . . . 10 ⊢ (𝑦 = 𝑥 → (𝜑 ↔ 𝜓)) |
| 8 | 7 | bicomd 223 | . . . . . . . . 9 ⊢ (𝑦 = 𝑥 → (𝜓 ↔ 𝜑)) |
| 9 | 8 | rspcev 3564 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝜑) → ∃𝑦 ∈ ℕ0 𝜓) |
| 10 | 4, 5, 9 | syl2anc 585 | . . . . . . 7 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → ∃𝑦 ∈ ℕ0 𝜓) |
| 11 | 10 | ex 412 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (𝑥 ∈ ℕ0 → ∃𝑦 ∈ ℕ0 𝜓)) |
| 12 | simpr 484 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) → -𝑥 ∈ ℕ0) | |
| 13 | zcn 12529 | . . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
| 14 | 13 | negnegd 11496 | . . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ ℤ → --𝑥 = 𝑥) |
| 15 | 14 | eqcomd 2742 | . . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℤ → 𝑥 = --𝑥) |
| 16 | negeq 11385 | . . . . . . . . . . . . . 14 ⊢ (𝑦 = -𝑥 → -𝑦 = --𝑥) | |
| 17 | 16 | eqeq2d 2747 | . . . . . . . . . . . . 13 ⊢ (𝑦 = -𝑥 → (𝑥 = -𝑦 ↔ 𝑥 = --𝑥)) |
| 18 | 15, 17 | syl5ibrcom 247 | . . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℤ → (𝑦 = -𝑥 → 𝑥 = -𝑦)) |
| 19 | 18 | imp 406 | . . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → 𝑥 = -𝑦) |
| 20 | rexzrexnn0.2 | . . . . . . . . . . 11 ⊢ (𝑥 = -𝑦 → (𝜑 ↔ 𝜒)) | |
| 21 | 19, 20 | syl 17 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → (𝜑 ↔ 𝜒)) |
| 22 | 21 | bicomd 223 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → (𝜒 ↔ 𝜑)) |
| 23 | 22 | adantlr 716 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) ∧ 𝑦 = -𝑥) → (𝜒 ↔ 𝜑)) |
| 24 | 12, 23 | rspcedv 3557 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) → (𝜑 → ∃𝑦 ∈ ℕ0 𝜒)) |
| 25 | 24 | impancom 451 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (-𝑥 ∈ ℕ0 → ∃𝑦 ∈ ℕ0 𝜒)) |
| 26 | 11, 25 | orim12d 967 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → ((𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0) → (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒))) |
| 27 | 3, 26 | mpd 15 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒)) |
| 28 | r19.43 3105 | . . . 4 ⊢ (∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒) ↔ (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒)) | |
| 29 | 27, 28 | sylibr 234 | . . 3 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| 30 | 29 | rexlimiva 3130 | . 2 ⊢ (∃𝑥 ∈ ℤ 𝜑 → ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| 31 | nn0z 12548 | . . . . 5 ⊢ (𝑦 ∈ ℕ0 → 𝑦 ∈ ℤ) | |
| 32 | 6 | rspcev 3564 | . . . . 5 ⊢ ((𝑦 ∈ ℤ ∧ 𝜓) → ∃𝑥 ∈ ℤ 𝜑) |
| 33 | 31, 32 | sylan 581 | . . . 4 ⊢ ((𝑦 ∈ ℕ0 ∧ 𝜓) → ∃𝑥 ∈ ℤ 𝜑) |
| 34 | nn0negz 12565 | . . . . 5 ⊢ (𝑦 ∈ ℕ0 → -𝑦 ∈ ℤ) | |
| 35 | 20 | rspcev 3564 | . . . . 5 ⊢ ((-𝑦 ∈ ℤ ∧ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 36 | 34, 35 | sylan 581 | . . . 4 ⊢ ((𝑦 ∈ ℕ0 ∧ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 37 | 33, 36 | jaodan 960 | . . 3 ⊢ ((𝑦 ∈ ℕ0 ∧ (𝜓 ∨ 𝜒)) → ∃𝑥 ∈ ℤ 𝜑) |
| 38 | 37 | rexlimiva 3130 | . 2 ⊢ (∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 39 | 30, 38 | impbii 209 | 1 ⊢ (∃𝑥 ∈ ℤ 𝜑 ↔ ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 ∧ wa 395 ∨ wo 848 = wceq 1542 ∈ wcel 2114 ∃wrex 3061 ℝcr 11037 -cneg 11378 ℕ0cn0 12437 ℤcz 12524 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 ax-resscn 11095 ax-1cn 11096 ax-icn 11097 ax-addcl 11098 ax-addrcl 11099 ax-mulcl 11100 ax-mulrcl 11101 ax-mulcom 11102 ax-addass 11103 ax-mulass 11104 ax-distr 11105 ax-i2m1 11106 ax-1ne0 11107 ax-1rid 11108 ax-rnegex 11109 ax-rrecex 11110 ax-cnre 11111 ax-pre-lttri 11112 ax-pre-lttrn 11113 ax-pre-ltadd 11114 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3or 1088 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-nel 3037 df-ral 3052 df-rex 3062 df-reu 3343 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-pss 3909 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-iun 4935 df-br 5086 df-opab 5148 df-mpt 5167 df-tr 5193 df-id 5526 df-eprel 5531 df-po 5539 df-so 5540 df-fr 5584 df-we 5586 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-pred 6265 df-ord 6326 df-on 6327 df-lim 6328 df-suc 6329 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fo 6504 df-f1o 6505 df-fv 6506 df-riota 7324 df-ov 7370 df-oprab 7371 df-mpo 7372 df-om 7818 df-2nd 7943 df-frecs 8231 df-wrecs 8262 df-recs 8311 df-rdg 8349 df-er 8643 df-en 8894 df-dom 8895 df-sdom 8896 df-pnf 11181 df-mnf 11182 df-ltxr 11184 df-sub 11379 df-neg 11380 df-nn 12175 df-n0 12438 df-z 12525 |
| This theorem is referenced by: dvdsrabdioph 43238 |
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