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| Description: Equivalence of the Axiom of Choice (first form) of [Enderton] p. 49 and Maes' AC ackm 4844. The proof consists of lemmas kmlem1 4827 through kmlem16 4842 and this final theorem. AC is not used for the proof. Note: bypassing the first step (i.e. replacing aceq5 4802 with pm4.2 177) 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 4802 |
. 2
| |
| 2 | eqid 1522 |
. . . 4
| |
| 3 | 2 | kmlem13 4839 |
. . 3
|
| 4 | kmlem8 4834 |
. . . 4
| |
| 5 | 4 | albii 1040 |
. . 3
|
| 6 | 3, 5 | bitri 180 |
. 2
|
| 7 | df-ne 1634 |
. . . . . . . 8
| |
| 8 | 7 | bicomi 179 |
. . . . . . 7
|
| 9 | 8 | anbi2i 491 |
. . . . . 6
|
| 10 | 9 | anbi1i 492 |
. . . . 5
|
| 11 | 10 | imbi2i 192 |
. . . 4
|
| 12 | pm4.2 177 |
. . . 4
| |
| 13 | pm4.2 177 |
. . . 4
| |
| 14 | 11, 12, 13 | kmlem16 4842 |
. . 3
|
| 15 | 14 | albii 1040 |
. 2
|
| 16 | 1, 6, 15 | 3bitri 184 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ackm 4844 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1003 ax-gen 1004 ax-8 1005 ax-9 1006 ax-10 1007 ax-11 1008 ax-12 1009 ax-13 1010 ax-14 1011 ax-17 1012 ax-4 1014 ax-5o 1016 ax-6o 1019 ax-9o 1164 ax-10o 1182 ax-16 1252 ax-11o 1260 ax-ext 1504 ax-rep 2748 ax-sep 2758 ax-nul 2765 ax-pow 2798 ax-pr 2835 ax-un 2922 |
| This theorem depends on definitions: df-bi 154 df-or 231 df-an 232 df-ex 1022 df-sb 1214 df-eu 1424 df-mo 1425 df-clab 1510 df-cleq 1515 df-clel 1518 df-ne 1634 df-ral 1696 df-rex 1697 df-rab 1699 df-v 1859 df-dif 2100 df-un 2101 df-in 2102 df-ss 2104 df-nul 2332 df-pw 2454 df-sn 2464 df-pr 2465 df-op 2468 df-uni 2558 df-iun 2622 df-br 2675 df-opab 2722 df-id 2891 df-xp 3241 df-rel 3242 df-cnv 3243 df-co 3244 df-dm 3245 df-rn 3246 df-res 3247 df-ima 3248 df-fun 3249 df-fn 3250 df-fv 3255 |