| Mathbox for Stefan O'Rear |
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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 12711 | . . . . . . 7 ⊢ (𝑥 ∈ ℤ ↔ (𝑥 ∈ ℝ ∧ (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0))) | |
| 2 | 1 | simprbi 503 | . . . . . 6 ⊢ (𝑥 ∈ ℤ → (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0)) |
| 3 | 2 | adantr 486 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0)) |
| 4 | simpr 490 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → 𝑥 ∈ ℕ0) | |
| 5 | simplr 781 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → 𝜑) | |
| 6 | rexzrexnn0.1 | . . . . . . . . . . 11 ⊢ (𝑥 = 𝑦 → (𝜑 ↔ 𝜓)) | |
| 7 | 6 | equcoms 2052 | . . . . . . . . . 10 ⊢ (𝑦 = 𝑥 → (𝜑 ↔ 𝜓)) |
| 8 | 7 | bicomd 226 | . . . . . . . . 9 ⊢ (𝑦 = 𝑥 → (𝜓 ↔ 𝜑)) |
| 9 | 8 | rspcev 3576 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℕ0 ∧ 𝜑) → ∃𝑦 ∈ ℕ0 𝜓) |
| 10 | 4, 5, 9 | syl2anc 596 | . . . . . . 7 ⊢ (((𝑥 ∈ ℤ ∧ 𝜑) ∧ 𝑥 ∈ ℕ0) → ∃𝑦 ∈ ℕ0 𝜓) |
| 11 | 10 | ex 418 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (𝑥 ∈ ℕ0 → ∃𝑦 ∈ ℕ0 𝜓)) |
| 12 | simpr 490 | . . . . . . . 8 ⊢ ((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) → -𝑥 ∈ ℕ0) | |
| 13 | zcn 12701 | . . . . . . . . . . . . . . 15 ⊢ (𝑥 ∈ ℤ → 𝑥 ∈ ℂ) | |
| 14 | 13 | negnegd 11663 | . . . . . . . . . . . . . 14 ⊢ (𝑥 ∈ ℤ → - -𝑥 = 𝑥) |
| 15 | 14 | eqcomd 2766 | . . . . . . . . . . . . 13 ⊢ (𝑥 ∈ ℤ → 𝑥 = - -𝑥) |
| 16 | negeq 11552 | . . . . . . . . . . . . . 14 ⊢ (𝑦 = -𝑥 → -𝑦 = - -𝑥) | |
| 17 | 16 | eqeq2d 2771 | . . . . . . . . . . . . 13 ⊢ (𝑦 = -𝑥 → (𝑥 = -𝑦 ↔ 𝑥 = - -𝑥)) |
| 18 | 15, 17 | syl5ibrcom 250 | . . . . . . . . . . . 12 ⊢ (𝑥 ∈ ℤ → (𝑦 = -𝑥 → 𝑥 = -𝑦)) |
| 19 | 18 | imp 412 | . . . . . . . . . . 11 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → 𝑥 = -𝑦) |
| 20 | rexzrexnn0.2 | . . . . . . . . . . 11 ⊢ (𝑥 = -𝑦 → (𝜑 ↔ 𝜒)) | |
| 21 | 19, 20 | syl 18 | . . . . . . . . . 10 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → (𝜑 ↔ 𝜒)) |
| 22 | 21 | bicomd 226 | . . . . . . . . 9 ⊢ ((𝑥 ∈ ℤ ∧ 𝑦 = -𝑥) → (𝜒 ↔ 𝜑)) |
| 23 | 22 | adantlr 728 | . . . . . . . 8 ⊢ (((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) ∧ 𝑦 = -𝑥) → (𝜒 ↔ 𝜑)) |
| 24 | 12, 23 | rspcedv 3569 | . . . . . . 7 ⊢ ((𝑥 ∈ ℤ ∧ -𝑥 ∈ ℕ0) → (𝜑 → ∃𝑦 ∈ ℕ0 𝜒)) |
| 25 | 24 | impancom 457 | . . . . . 6 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → ( -𝑥 ∈ ℕ0 → ∃𝑦 ∈ ℕ0 𝜒)) |
| 26 | 11, 25 | orim12d 979 | . . . . 5 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → ((𝑥 ∈ ℕ0 ∨ -𝑥 ∈ ℕ0) → (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒))) |
| 27 | 3, 26 | mpd 16 | . . . 4 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒)) |
| 28 | r19.43 3130 | . . . 4 ⊢ (∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒) ↔ (∃𝑦 ∈ ℕ0 𝜓 ∨ ∃𝑦 ∈ ℕ0 𝜒)) | |
| 29 | 27, 28 | sylibr 237 | . . 3 ⊢ ((𝑥 ∈ ℤ ∧ 𝜑) → ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| 30 | 29 | rexlimiva 3155 | . 2 ⊢ (∃𝑥 ∈ ℤ 𝜑 → ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| 31 | nn0z 12720 | . . . . 5 ⊢ (𝑦 ∈ ℕ0 → 𝑦 ∈ ℤ) | |
| 32 | 6 | rspcev 3576 | . . . . 5 ⊢ ((𝑦 ∈ ℤ ∧ 𝜓) → ∃𝑥 ∈ ℤ 𝜑) |
| 33 | 31, 32 | sylan 592 | . . . 4 ⊢ ((𝑦 ∈ ℕ0 ∧ 𝜓) → ∃𝑥 ∈ ℤ 𝜑) |
| 34 | nn0negz 12737 | . . . . 5 ⊢ (𝑦 ∈ ℕ0 → -𝑦 ∈ ℤ) | |
| 35 | 20 | rspcev 3576 | . . . . 5 ⊢ (( -𝑦 ∈ ℤ ∧ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 36 | 34, 35 | sylan 592 | . . . 4 ⊢ ((𝑦 ∈ ℕ0 ∧ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 37 | 33, 36 | jaodan 972 | . . 3 ⊢ ((𝑦 ∈ ℕ0 ∧ (𝜓 ∨ 𝜒)) → ∃𝑥 ∈ ℤ 𝜑) |
| 38 | 37 | rexlimiva 3155 | . 2 ⊢ (∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒) → ∃𝑥 ∈ ℤ 𝜑) |
| 39 | 30, 38 | impbii 212 | 1 ⊢ (∃𝑥 ∈ ℤ 𝜑 ↔ ∃𝑦 ∈ ℕ0 (𝜓 ∨ 𝜒)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∧ wa 401 ∨ wo 861 = wceq 1569 ∈ wcel 2144 ∃wrex 3086 ℝcr 11202 -cneg 11545 ℕ0cn0 12609 ℤcz 12696 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-10 2177 ax-11 2193 ax-12 2212 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 ax-un 7751 ax-resscn 11260 ax-1cn 11261 ax-icn 11262 ax-addcl 11263 ax-addrcl 11264 ax-mulcl 11265 ax-mulrcl 11266 ax-mulcom 11267 ax-addass 11268 ax-mulass 11269 ax-distr 11270 ax-i2m1 11271 ax-1ne0 11272 ax-1rid 11273 ax-rnegex 11274 ax-rrecex 11275 ax-cnre 11276 ax-pre-lttri 11277 ax-pre-lttrn 11278 ax-pre-ltadd 11279 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3or 1104 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2099 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-reu 3366 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-ss 3896 df-pss 4014 df-dif 4047 df-in 4091 df-un 4151 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4585 df-pr 4587 df-op 4835 df-uni 4867 df-iun 4952 df-br 5103 df-opab 5167 df-mpt 5186 df-tr 5212 df-id 5545 df-eprel 5550 df-po 5558 df-so 5559 df-fr 5603 df-we 5605 df-xp 5656 df-rel 5657 df-cnv 5658 df-co 5659 df-dm 5660 df-rn 5661 df-res 5662 df-ima 5663 df-pred 6304 df-ord 6365 df-on 6366 df-lim 6367 df-suc 6368 df-iota 6494 df-fun 6540 df-fn 6541 df-f 6542 df-f1 6543 df-fo 6544 df-f1o 6545 df-fv 6546 df-riota 7377 df-ov 7423 df-oprab 7424 df-mpo 7425 df-om 7878 df-2nd 8002 df-frecs 8302 df-wrecs 8333 df-recs 8382 df-rdg 8421 df-er 8720 df-en 8977 df-dom 8978 df-sdom 8979 df-pnf 11348 df-mnf 11349 df-ltxr 11351 df-sub 11546 df-neg 11547 df-nn 12339 df-n0 12610 df-z 12697 |
| This theorem is used by: dvdsrabdioph 43910 |
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