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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 5470 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ensymi 5472 0sdomg 5529 phplem4 5605 nneneq 5606 php 5607 php2 5608 php3 5609 ominf 5622 isfinite2 5639 infcntss 5646 unifi 5648 fiint 5650 fodomfi 5656 isfinite 5741 nnsdom 5742 karden 5856 numthcor 5948 iscard2 6006 ondomcard 6009 alephordi 6022 nnacda 6088 infxpidmlem1 8821 infxpidmlem12 8832 infcda 8836 infdif 8837 infdif2 8838 infxp 8841 infmap2lem1 8848 infmap2 8850 alephsuc3 8854 dif1enOLD 10173 indexfi 10174 isprm2lem 13774 unpde2eg22 14407 set2elt 14408 isfinite1b 14434 finminlem 15367 finsschain 15373 fcluscomplem 15620 indexfiOLD 15755 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 1304 ax-gen 1305 ax-8 1306 ax-9 1307 ax-10 1308 ax-11 1309 ax-12 1310 ax-13 1311 ax-14 1312 ax-17 1317 ax-4 1319 ax-5o 1321 ax-6o 1324 ax-9o 1481 ax-10o 1500 ax-16 1580 ax-11o 1588 ax-ext 1865 ax-rep 3428 ax-sep 3438 ax-nul 3445 ax-pow 3481 ax-pr 3524 ax-un 3790 |
| This theorem depends on definitions: df-bi 164 df-or 241 df-an 242 df-3an 860 df-ex 1327 df-sb 1536 df-eu 1775 df-mo 1776 df-clab 1872 df-cleq 1877 df-clel 1880 df-ne 2019 df-rex 2110 df-v 2294 df-dif 2597 df-un 2600 df-in 2603 df-ss 2605 df-nul 2876 df-pw 3035 df-sn 3049 df-pr 3050 df-op 3053 df-uni 3178 df-br 3339 df-opab 3396 df-id 3586 df-xp 4000 df-rel 4001 df-cnv 4002 df-co 4003 df-dm 4004 df-rn 4005 df-res 4006 df-ima 4007 df-fun 4008 df-fn 4009 df-f 4010 df-f1 4011 df-fo 4012 df-f1o 4013 df-er 5318 df-en 5427 |