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| Description: Axiom of Choice, reproved from conditionless ZFC axioms. |
| Ref | Expression |
|---|---|
| zfcndac |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axacnd 4936 |
. . 3
| |
| 2 | ax-17 968 |
. . . . . . 7
| |
| 3 | 2 | 19.3 1027 |
. . . . . 6
|
| 4 | 3 | imbi1i 186 |
. . . . 5
|
| 5 | 4 | 2albii 997 |
. . . 4
|
| 6 | 5 | exbii 1047 |
. . 3
|
| 7 | 1, 6 | mpbi 189 |
. 2
|
| 8 | equequ2 1131 |
. . . . . . . . . 10
| |
| 9 | 8 | bibi2d 616 |
. . . . . . . . 9
|
| 10 | elequ2 1133 |
. . . . . . . . . . . . 13
| |
| 11 | 10 | anbi2d 614 |
. . . . . . . . . . . 12
|
| 12 | elequ2 1133 |
. . . . . . . . . . . . 13
| |
| 13 | elequ1 1132 |
. . . . . . . . . . . . 13
| |
| 14 | 12, 13 | anbi12d 626 |
. . . . . . . . . . . 12
|
| 15 | 11, 14 | anbi12d 626 |
. . . . . . . . . . 11
|
| 16 | 15 | cbvexv 1310 |
. . . . . . . . . 10
|
| 17 | 16 | bibi1i 607 |
. . . . . . . . 9
|
| 18 | 9, 17 | syl6bb 534 |
. . . . . . . 8
|
| 19 | 18 | albidv 1273 |
. . . . . . 7
|
| 20 | elequ1 1132 |
. . . . . . . . . . . 12
| |
| 21 | 20 | anbi1d 615 |
. . . . . . . . . . 11
|
| 22 | elequ1 1132 |
. . . . . . . . . . . 12
| |
| 23 | 22 | anbi1d 615 |
. . . . . . . . . . 11
|
| 24 | 21, 23 | anbi12d 626 |
. . . . . . . . . 10
|
| 25 | 24 | exbidv 1274 |
. . . . . . . . 9
|
| 26 | equequ1 1130 |
. . . . . . . . 9
| |
| 27 | 25, 26 | bibi12d 627 |
. . . . . . . 8
|
| 28 | 27 | cbvalv 1309 |
. . . . . . 7
|
| 29 | 19, 28 | syl6bb 534 |
. . . . . 6
|
| 30 | 29 | cbvexv 1310 |
. . . . 5
|
| 31 | 30 | imbi2i 185 |
. . . 4
|
| 32 | 31 | 2albii 997 |
. . 3
|
| 33 | 32 | exbii 1047 |
. 2
|
| 34 | 7, 33 | mpbir 190 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 959 ax-gen 960 ax-8 961 ax-10 963 ax-11 964 ax-12 965 ax-13 966 ax-14 967 ax-17 968 ax-4 970 ax-5o 972 ax-6o 975 ax-9o 1119 ax-10o 1136 ax-16 1206 ax-11o 1213 ax-15 1353 ax-ext 1452 ax-sep 2693 ax-pow 2732 ax-pr 2769 ax-reg 4565 ax-ac 4716 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 775 df-ex 978 df-sb 1168 df-eu 1375 df-mo 1376 df-clab 1457 df-cleq 1462 df-clel 1465 df-ne 1579 df-ral 1641 df-rex 1642 df-v 1803 df-dif 2039 df-un 2040 df-in 2041 df-ss 2043 df-nul 2271 df-pw 2392 df-sn 2402 df-pr 2403 df-op 2406 df-br 2610 df-opab 2657 df-eprel 2821 df-fr 2907 |