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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 9009 | . 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 5114 ≈ cen 8949 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2195 ax-12 2216 ax-ext 2738 ax-sep 5262 ax-pow 5341 ax-pr 5409 ax-un 7745 |
| 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 2100 df-mo 2570 df-eu 2600 df-clab 2745 df-cleq 2758 df-clel 2841 df-nfc 2915 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-pw 4569 df-sn 4595 df-pr 4597 df-op 4601 df-uni 4878 df-br 5115 df-opab 5179 df-id 5561 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-ima 5679 df-fun 6545 df-fn 6546 df-f 6547 df-f1 6548 df-fo 6549 df-f1o 6550 df-er 8703 df-en 8953 |
| This theorem is used by: entr2i 9015 entr3i 9016 entr4i 9017 pm54.43 10006 infxpenlem 10016 unsnen 10555 cfpwsdom 10587 tskinf 10772 inar1 10778 gruina 10821 uzenom 14020 znnen 16293 qnnen 16294 rexpen 16309 rucALT 16311 aleph1re 16326 aleph1irr 16327 unben 16994 ex-chn2 18719 1stcfb 23639 2ndcredom 23644 hauspwdom 23695 met1stc 24715 ovolctb2 25688 ovolfi 25690 ovoliunlem3 25700 uniiccdif 25774 dyadmbl 25796 mbfimaopnlem 25851 aannenlem3 26530 f1ocnt 33182 dmvlsiga 34550 sigapildsys 34584 omssubadd 34722 carsgclctunlem3 34742 pellex 43603 tr3dom 44295 nnfoctb 45809 nnf1oxpnn 45954 ioonct 46294 caragenunicl 47279 rrx2xpreen 49540 aacllem 50662 |
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