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Mirrors > Home > NFE Home > Th. List > dfcnv2 | GIF version |
Description: Definition of converse in terms of image and Swap . (Contributed by set.mm contributors, 8-Jan-2015.) |
Ref | Expression |
---|---|
dfcnv2 | ⊢ ◡A = ( Swap “ A) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vex 2863 | . . . . . . 7 ⊢ x ∈ V | |
2 | vex 2863 | . . . . . . 7 ⊢ y ∈ V | |
3 | 1, 2 | brswap2 4861 | . . . . . 6 ⊢ (z Swap 〈x, y〉 ↔ z = 〈y, x〉) |
4 | 3 | anbi1i 676 | . . . . 5 ⊢ ((z Swap 〈x, y〉 ∧ z ∈ A) ↔ (z = 〈y, x〉 ∧ z ∈ A)) |
5 | 4 | exbii 1582 | . . . 4 ⊢ (∃z(z Swap 〈x, y〉 ∧ z ∈ A) ↔ ∃z(z = 〈y, x〉 ∧ z ∈ A)) |
6 | 2, 1 | opex 4589 | . . . . 5 ⊢ 〈y, x〉 ∈ V |
7 | eleq1 2413 | . . . . 5 ⊢ (z = 〈y, x〉 → (z ∈ A ↔ 〈y, x〉 ∈ A)) | |
8 | 6, 7 | ceqsexv 2895 | . . . 4 ⊢ (∃z(z = 〈y, x〉 ∧ z ∈ A) ↔ 〈y, x〉 ∈ A) |
9 | 5, 8 | bitri 240 | . . 3 ⊢ (∃z(z Swap 〈x, y〉 ∧ z ∈ A) ↔ 〈y, x〉 ∈ A) |
10 | elima 4755 | . . . 4 ⊢ (〈x, y〉 ∈ ( Swap “ A) ↔ ∃z ∈ A z Swap 〈x, y〉) | |
11 | df-rex 2621 | . . . . 5 ⊢ (∃z ∈ A z Swap 〈x, y〉 ↔ ∃z(z ∈ A ∧ z Swap 〈x, y〉)) | |
12 | exancom 1586 | . . . . 5 ⊢ (∃z(z ∈ A ∧ z Swap 〈x, y〉) ↔ ∃z(z Swap 〈x, y〉 ∧ z ∈ A)) | |
13 | 11, 12 | bitri 240 | . . . 4 ⊢ (∃z ∈ A z Swap 〈x, y〉 ↔ ∃z(z Swap 〈x, y〉 ∧ z ∈ A)) |
14 | 10, 13 | bitri 240 | . . 3 ⊢ (〈x, y〉 ∈ ( Swap “ A) ↔ ∃z(z Swap 〈x, y〉 ∧ z ∈ A)) |
15 | opelcnv 4894 | . . 3 ⊢ (〈x, y〉 ∈ ◡A ↔ 〈y, x〉 ∈ A) | |
16 | 9, 14, 15 | 3bitr4ri 269 | . 2 ⊢ (〈x, y〉 ∈ ◡A ↔ 〈x, y〉 ∈ ( Swap “ A)) |
17 | 16 | eqrelriv 4851 | 1 ⊢ ◡A = ( Swap “ A) |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 358 ∃wex 1541 = wceq 1642 ∈ wcel 1710 ∃wrex 2616 〈cop 4562 class class class wbr 4640 Swap cswap 4719 “ cima 4723 ◡ccnv 4772 |
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 df-opab 4624 df-br 4641 df-swap 4725 df-ima 4728 df-cnv 4786 |
This theorem is referenced by: cnvexg 5102 swapres 5513 enex 6032 |
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