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| Description: Axiom of Choice, reproved from conditionless ZFC axioms. |
| Ref | Expression |
|---|---|
| zfcndac |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | axacnd 4887 |
. . 3
| |
| 2 | ax-17 1190 |
. . . . . . 7
| |
| 3 | 2 | 19.3 1007 |
. . . . . 6
|
| 4 | 3 | imbi1i 186 |
. . . . 5
|
| 5 | 4 | 2albii 976 |
. . . 4
|
| 6 | 5 | exbii 1027 |
. . 3
|
| 7 | 1, 6 | mpbi 189 |
. 2
|
| 8 | equequ2 1122 |
. . . . . . . . . 10
| |
| 9 | 8 | bibi2d 616 |
. . . . . . . . 9
|
| 10 | elequ2 1124 |
. . . . . . . . . . . . 13
| |
| 11 | 10 | anbi2d 614 |
. . . . . . . . . . . 12
|
| 12 | elequ2 1124 |
. . . . . . . . . . . . 13
| |
| 13 | elequ1 1123 |
. . . . . . . . . . . . 13
| |
| 14 | 12, 13 | anbi12d 626 |
. . . . . . . . . . . 12
|
| 15 | 11, 14 | anbi12d 626 |
. . . . . . . . . . 11
|
| 16 | 15 | cbvexv 1297 |
. . . . . . . . . 10
|
| 17 | 16 | bibi1i 607 |
. . . . . . . . 9
|
| 18 | 9, 17 | syl6bb 534 |
. . . . . . . 8
|
| 19 | 18 | albidv 1260 |
. . . . . . 7
|
| 20 | elequ1 1123 |
. . . . . . . . . . . 12
| |
| 21 | 20 | anbi1d 615 |
. . . . . . . . . . 11
|
| 22 | elequ1 1123 |
. . . . . . . . . . . 12
| |
| 23 | 22 | anbi1d 615 |
. . . . . . . . . . 11
|
| 24 | 21, 23 | anbi12d 626 |
. . . . . . . . . 10
|
| 25 | 24 | exbidv 1261 |
. . . . . . . . 9
|
| 26 | equequ1 1121 |
. . . . . . . . 9
| |
| 27 | 25, 26 | bibi12d 627 |
. . . . . . . 8
|
| 28 | 27 | cbvalv 1296 |
. . . . . . 7
|
| 29 | 19, 28 | syl6bb 534 |
. . . . . 6
|
| 30 | 29 | cbvexv 1297 |
. . . . 5
|
| 31 | 30 | imbi2i 185 |
. . . 4
|
| 32 | 31 | 2albii 976 |
. . 3
|
| 33 | 32 | exbii 1027 |
. 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-4 951 ax-5 952 ax-6 953 ax-7 954 ax-gen 955 ax-8 1101 ax-9 1102 ax-10 1103 ax-12 1104 ax-13 1107 ax-14 1108 ax-11 1180 ax-17 1190 ax-16 1194 ax-11o 1202 ax-ext 1436 ax-sep 2671 ax-pow 2710 ax-pr 2747 ax-reg 4517 ax-ac 4668 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 774 df-ex 957 df-sb 1155 df-eu 1359 df-mo 1360 df-clab 1441 df-cleq 1446 df-clel 1449 df-ne 1563 df-ral 1625 df-rex 1626 df-v 1787 df-dif 2020 df-un 2021 df-in 2022 df-ss 2024 df-nul 2252 df-pw 2373 df-sn 2383 df-pr 2384 df-op 2387 df-br 2588 df-opab 2635 df-eprel 2794 df-fr 2880 |