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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 4398 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ensymi 4400 0sdomg 4452 phplem4 4497 nneneq 4498 php 4499 php2 4500 php3 4501 ominf 4514 isfinite2 4529 infcntss 4536 unifi 4538 fiint 4540 fodomfi 4546 isfinite 4614 nnsdom 4615 karden 4706 numthcor 4766 iscard2 4834 ondomcard 4837 alephordi 4854 infxpidmlem1 7503 infxpidmlem12 7514 infcda 7518 infdif 7519 infdif2 7520 infxp 7523 infmap2lem1 7529 infmap2 7531 alephsuc3 7535 |
| 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-pow 2737 ax-pr 2774 ax-un 2861 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 776 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-rex 1647 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-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-f 3189 df-f1 3190 df-fo 3191 df-f1o 3192 df-er 4251 df-en 4357 |