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| Description: Equivalence of the Axiom of Choice (first form) of [Enderton] p. 49 and Maes' AC ackm 4762. The proof consists of lemmas kmlem1 4745 through kmlem16 4760 and this final theorem. AC is not used for the proof. Note: bypassing the first step (i.e. replacing aceq5 4720 with pm4.2 170) establishes the AC equivalence shown by Mae's writeup. The left-hand-side AC shown here was chosen because it is shorter to display. |
| Ref | Expression |
|---|---|
| aceqkm |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | aceq5 4720 |
. 2
| |
| 2 | eqid 1473 |
. . . 4
| |
| 3 | 2 | kmlem13 4757 |
. . 3
|
| 4 | kmlem8 4752 |
. . . 4
| |
| 5 | 4 | albii 997 |
. . 3
|
| 6 | 3, 5 | bitr 173 |
. 2
|
| 7 | df-ne 1584 |
. . . . . . . 8
| |
| 8 | 7 | bicomi 172 |
. . . . . . 7
|
| 9 | 8 | anbi2i 480 |
. . . . . 6
|
| 10 | 9 | anbi1i 481 |
. . . . 5
|
| 11 | 10 | imbi2i 185 |
. . . 4
|
| 12 | pm4.2 170 |
. . . 4
| |
| 13 | pm4.2 170 |
. . . 4
| |
| 14 | 11, 12, 13 | kmlem16 4760 |
. . 3
|
| 15 | 14 | albii 997 |
. 2
|
| 16 | 1, 6, 15 | 3bitr 177 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ackm 4762 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 960 ax-gen 961 ax-8 962 ax-9 963 ax-10 964 ax-11 965 ax-12 966 ax-13 967 ax-14 968 ax-17 969 ax-4 971 ax-5o 973 ax-6o 976 ax-9o 1121 ax-10o 1138 ax-16 1208 ax-11o 1216 ax-ext 1457 ax-rep 2688 ax-sep 2698 ax-nul 2705 ax-pow 2737 ax-pr 2774 ax-un 2861 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-ex 979 df-sb 1170 df-eu 1380 df-mo 1381 df-clab 1462 df-cleq 1467 df-clel 1470 df-ne 1584 df-ral 1646 df-rex 1647 df-rab 1649 df-v 1808 df-dif 2045 df-un 2046 df-in 2047 df-ss 2049 df-nul 2277 df-pw 2398 df-sn 2408 df-pr 2409 df-op 2412 df-uni 2499 df-iun 2563 df-br 2615 df-opab 2662 df-id 2830 df-xp 3179 df-rel 3180 df-cnv 3181 df-co 3182 df-dm 3183 df-rn 3184 df-res 3185 df-ima 3186 df-fun 3187 df-fn 3188 df-fv 3193 |