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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 4552 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ensymi 4554 0sdomg 4611 phplem4 4658 nneneq 4659 php 4660 php2 4661 php3 4662 ominf 4675 isfinite2 4692 infcntss 4699 unifi 4701 fiint 4703 fodomfi 4709 isfinite 4780 nnsdom 4781 karden 4872 numthcor 4932 iscard2 5004 ondomcard 5007 alephordi 5024 nnacda 5090 infxpidmlem1 7764 infxpidmlem12 7775 infcda 7779 infdif 7780 infdif2 7781 infxp 7784 infmap2lem1 7791 infmap2 7793 alephsuc3 7797 unpde2eg22 10826 set2elt 10827 finminlem 11418 finsschain 11425 fcluscomplem 11732 dif1en 11833 indexf 11847 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 998 ax-gen 999 ax-8 1000 ax-9 1001 ax-10 1002 ax-11 1003 ax-12 1004 ax-13 1005 ax-14 1006 ax-17 1007 ax-4 1009 ax-5o 1011 ax-6o 1014 ax-9o 1159 ax-10o 1177 ax-16 1247 ax-11o 1255 ax-ext 1500 ax-rep 2767 ax-sep 2777 ax-pow 2818 ax-pr 2855 ax-un 3089 |
| This theorem depends on definitions: df-bi 145 df-or 222 df-an 223 df-3an 783 df-ex 1017 df-sb 1209 df-eu 1421 df-mo 1422 df-clab 1506 df-cleq 1511 df-clel 1514 df-ne 1630 df-rex 1696 df-v 1858 df-dif 2101 df-un 2102 df-in 2103 df-ss 2105 df-nul 2333 df-pw 2459 df-sn 2470 df-pr 2471 df-op 2474 df-uni 2570 df-br 2693 df-opab 2741 df-id 2913 df-xp 3265 df-rel 3266 df-cnv 3267 df-co 3268 df-dm 3269 df-rn 3270 df-res 3271 df-ima 3272 df-fun 3273 df-fn 3274 df-f 3275 df-f1 3276 df-fo 3277 df-f1o 3278 df-er 4401 df-en 4509 |