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| Mirrors > Home > MPE Home > Th. List > ensymi | Structured version Visualization version GIF version | ||
| Description: Symmetry of equinumerosity. Theorem 2 of [Suppes] p. 92. (Contributed by NM, 25-Sep-2004.) |
| Ref | Expression |
|---|---|
| ensymi.2 | ⊢ 𝐴 ≈ 𝐵 |
| Ref | Expression |
|---|---|
| ensymi | ⊢ 𝐵 ≈ 𝐴 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ensymi.2 | . 2 ⊢ 𝐴 ≈ 𝐵 | |
| 2 | ensym 9058 | . 2 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 3 | 1, 2 | ax-mp 5 | 1 ⊢ 𝐵 ≈ 𝐴 |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: class class class wbr 5106 ≈ cen 8998 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-pow 5331 ax-pr 5395 ax-un 7775 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-mo 2567 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5171 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-er 8745 df-en 9002 |
| This theorem is used by: entr2i 9064 entr3i 9065 entr4i 9066 pm54.43 10109 infxpenlem 10119 unsnen 10664 cfpwsdom 10696 tskinf 10881 inar1 10887 gruina 10930 uzenom 14134 znnen 16409 qnnen 16410 rexpen 16425 rucALT 16427 aleph1re 16442 aleph1irr 16443 unben 17116 ex-chn2 18841 1stcfb 23793 2ndcredom 23798 hauspwdom 23850 met1stc 24870 ovolctb2 25843 ovolfi 25845 ovoliunlem3 25855 uniiccdif 25929 dyadmbl 25951 mbfimaopnlem 26006 aannenlem3 26687 f1ocnt 33462 dmvlsiga 34831 sigapildsys 34865 carsgclctunlem3 35022 pellex 44035 tr3dom 44721 nnfoctb 46270 nnf1oxpnn 46415 ioonct 46754 caragenunicl 47739 rrx2xpreen 50037 aacllem 51219 |
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