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| Description: Symmetry of equinumerosity. Theorem 2 of [Suppes] p. 92. |
| Ref | Expression |
|---|---|
| ensym.1 |
|
| Ref | Expression |
|---|---|
| ensym |
|
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ensym.1 |
. 2
| |
| 2 | ensymg 4411 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ensymi 4413 0sdomg 4466 phplem4 4511 nneneq 4512 php 4513 php2 4514 php3 4515 php3OLD 4516 ominfOLD 4529 isfinite2OLD 4546 infcntss 4554 unifiOLD 4557 fiint 4559 fiintOLD 4560 fodomfiOLD 4566 isfiniteOLD 4634 nnsdom 4635 karden 4726 numthcor 4786 iscard2 4854 ondomcard 4857 alephordi 4874 infxpidmlem1 7552 infxpidmlem12 7563 infcda 7567 infdif 7568 infdif2 7569 infxp 7572 infmap2lem1 7579 infmap2 7581 alephsuc3 7585 set2elt 10545 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 962 ax-gen 963 ax-8 964 ax-9 965 ax-10 966 ax-11 967 ax-12 968 ax-13 969 ax-14 970 ax-17 971 ax-4 973 ax-5o 975 ax-6o 978 ax-9o 1123 ax-10o 1140 ax-16 1210 ax-11o 1218 ax-ext 1459 ax-rep 2693 ax-sep 2703 ax-pow 2742 ax-pr 2779 ax-un 2866 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 777 df-ex 981 df-sb 1172 df-eu 1382 df-mo 1383 df-clab 1464 df-cleq 1469 df-clel 1472 df-ne 1587 df-rex 1650 df-v 1812 df-dif 2049 df-un 2050 df-in 2051 df-ss 2053 df-nul 2281 df-pw 2402 df-sn 2412 df-pr 2413 df-op 2416 df-uni 2504 df-br 2620 df-opab 2667 df-id 2835 df-xp 3184 df-rel 3185 df-cnv 3186 df-co 3187 df-dm 3188 df-rn 3189 df-res 3190 df-ima 3191 df-fun 3192 df-fn 3193 df-f 3194 df-f1 3195 df-fo 3196 df-f1o 3197 df-er 4261 df-en 4368 |