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Mirrors > Home > NFE Home > Th. List > copsex2g | GIF version |
Description: Implicit substitution inference for ordered pairs. (Contributed by NM, 28-May-1995.) |
Ref | Expression |
---|---|
copsex2g.1 | ⊢ ((x = A ∧ y = B) → (φ ↔ ψ)) |
Ref | Expression |
---|---|
copsex2g | ⊢ ((A ∈ V ∧ B ∈ W) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elisset 2870 | . 2 ⊢ (A ∈ V → ∃x x = A) | |
2 | elisset 2870 | . 2 ⊢ (B ∈ W → ∃y y = B) | |
3 | eeanv 1913 | . . 3 ⊢ (∃x∃y(x = A ∧ y = B) ↔ (∃x x = A ∧ ∃y y = B)) | |
4 | nfe1 1732 | . . . . 5 ⊢ Ⅎx∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) | |
5 | nfv 1619 | . . . . 5 ⊢ Ⅎxψ | |
6 | 4, 5 | nfbi 1834 | . . . 4 ⊢ Ⅎx(∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ) |
7 | nfe1 1732 | . . . . . . 7 ⊢ Ⅎy∃y(〈A, B〉 = 〈x, y〉 ∧ φ) | |
8 | 7 | nfex 1843 | . . . . . 6 ⊢ Ⅎy∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) |
9 | nfv 1619 | . . . . . 6 ⊢ Ⅎyψ | |
10 | 8, 9 | nfbi 1834 | . . . . 5 ⊢ Ⅎy(∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ) |
11 | opeq12 4581 | . . . . . . 7 ⊢ ((x = A ∧ y = B) → 〈x, y〉 = 〈A, B〉) | |
12 | copsexg 4608 | . . . . . . . 8 ⊢ (〈A, B〉 = 〈x, y〉 → (φ ↔ ∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ))) | |
13 | 12 | eqcoms 2356 | . . . . . . 7 ⊢ (〈x, y〉 = 〈A, B〉 → (φ ↔ ∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ))) |
14 | 11, 13 | syl 15 | . . . . . 6 ⊢ ((x = A ∧ y = B) → (φ ↔ ∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ))) |
15 | copsex2g.1 | . . . . . 6 ⊢ ((x = A ∧ y = B) → (φ ↔ ψ)) | |
16 | 14, 15 | bitr3d 246 | . . . . 5 ⊢ ((x = A ∧ y = B) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
17 | 10, 16 | exlimi 1803 | . . . 4 ⊢ (∃y(x = A ∧ y = B) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
18 | 6, 17 | exlimi 1803 | . . 3 ⊢ (∃x∃y(x = A ∧ y = B) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
19 | 3, 18 | sylbir 204 | . 2 ⊢ ((∃x x = A ∧ ∃y y = B) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
20 | 1, 2, 19 | syl2an 463 | 1 ⊢ ((A ∈ V ∧ B ∈ W) → (∃x∃y(〈A, B〉 = 〈x, y〉 ∧ φ) ↔ ψ)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 176 ∧ wa 358 ∃wex 1541 = wceq 1642 ∈ wcel 1710 〈cop 4562 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1546 ax-5 1557 ax-17 1616 ax-9 1654 ax-8 1675 ax-13 1712 ax-14 1714 ax-6 1729 ax-7 1734 ax-11 1746 ax-12 1925 ax-ext 2334 ax-nin 4079 ax-xp 4080 ax-cnv 4081 ax-1c 4082 ax-sset 4083 ax-si 4084 ax-ins2 4085 ax-ins3 4086 ax-typlower 4087 ax-sn 4088 |
This theorem depends on definitions: df-bi 177 df-or 359 df-an 360 df-3or 935 df-3an 936 df-nan 1288 df-tru 1319 df-ex 1542 df-nf 1545 df-sb 1649 df-eu 2208 df-mo 2209 df-clab 2340 df-cleq 2346 df-clel 2349 df-nfc 2479 df-ne 2519 df-ral 2620 df-rex 2621 df-reu 2622 df-rmo 2623 df-rab 2624 df-v 2862 df-sbc 3048 df-nin 3212 df-compl 3213 df-in 3214 df-un 3215 df-dif 3216 df-symdif 3217 df-ss 3260 df-pss 3262 df-nul 3552 df-if 3664 df-pw 3725 df-sn 3742 df-pr 3743 df-uni 3893 df-int 3928 df-opk 4059 df-1c 4137 df-pw1 4138 df-uni1 4139 df-xpk 4186 df-cnvk 4187 df-ins2k 4188 df-ins3k 4189 df-imak 4190 df-cok 4191 df-p6 4192 df-sik 4193 df-ssetk 4194 df-imagek 4195 df-idk 4196 df-iota 4340 df-0c 4378 df-addc 4379 df-nnc 4380 df-fin 4381 df-lefin 4441 df-ltfin 4442 df-ncfin 4443 df-tfin 4444 df-evenfin 4445 df-oddfin 4446 df-sfin 4447 df-spfin 4448 df-phi 4566 df-op 4567 df-proj1 4568 df-proj2 4569 |
This theorem is referenced by: opelopabga 4701 ov6g 5601 |
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