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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 4417 |
. 2
| |
| 3 | 1, 2 | ax-mp 7 |
1
|
| Colors of variables: wff set class |
| Syntax hints: |
| This theorem is referenced by: ensymi 4419 0sdomg 4472 phplem4 4517 nneneq 4518 php 4519 php2 4520 php3 4521 php3OLD 4522 ominf 4536 ominfOLD 4537 isfinite2 4557 isfinite2OLD 4558 infcntss 4567 unifiOLD 4570 fiint 4572 fiintOLD 4573 fodomfi 4575 fodomfiOLD 4576 isfinite 4643 isfiniteOLD 4644 nnsdom 4645 karden 4736 numthcor 4796 iscard2 4865 ondomcard 4868 alephordi 4885 infxpidmlem1 7553 infxpidmlem12 7564 infcda 7568 infdif 7569 infdif2 7570 infxp 7573 infmap2lem1 7581 infmap2 7583 alephsuc3 7587 set2elt 10531 |
| This theorem was proved from axioms: ax-1 4 ax-2 5 ax-3 6 ax-mp 7 ax-7 964 ax-gen 965 ax-8 966 ax-9 967 ax-10 968 ax-11 969 ax-12 970 ax-13 971 ax-14 972 ax-17 973 ax-4 975 ax-5o 977 ax-6o 980 ax-9o 1125 ax-10o 1142 ax-16 1212 ax-11o 1220 ax-ext 1462 ax-rep 2698 ax-sep 2708 ax-pow 2748 ax-pr 2785 ax-un 2872 |
| This theorem depends on definitions: df-bi 147 df-or 224 df-an 225 df-3an 779 df-ex 983 df-sb 1174 df-eu 1384 df-mo 1385 df-clab 1467 df-cleq 1472 df-clel 1475 df-ne 1590 df-rex 1653 df-v 1815 df-dif 2052 df-un 2053 df-in 2054 df-ss 2056 df-nul 2284 df-pw 2406 df-sn 2416 df-pr 2417 df-op 2420 df-uni 2508 df-br 2625 df-opab 2672 df-id 2841 df-xp 3190 df-rel 3191 df-cnv 3192 df-co 3193 df-dm 3194 df-rn 3195 df-res 3196 df-ima 3197 df-fun 3198 df-fn 3199 df-f 3200 df-f1 3201 df-fo 3202 df-f1o 3203 df-er 4267 df-en 4374 |