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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 9002 | . 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 5112 ≈ cen 8942 |
| 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 5260 ax-pow 5339 ax-pr 5407 ax-un 7738 |
| 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 4491 df-pw 4567 df-sn 4593 df-pr 4595 df-op 4599 df-uni 4876 df-br 5113 df-opab 5177 df-id 5559 df-xp 5670 df-rel 5671 df-cnv 5672 df-co 5673 df-dm 5674 df-rn 5675 df-res 5676 df-ima 5677 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-er 8696 df-en 8946 |
| This theorem is used by: entr2i 9008 entr3i 9009 entr4i 9010 pm54.43 9998 infxpenlem 10008 unsnen 10547 cfpwsdom 10579 tskinf 10764 inar1 10770 gruina 10813 uzenom 14011 znnen 16278 qnnen 16279 rexpen 16294 rucALT 16296 aleph1re 16311 aleph1irr 16312 unben 16979 ex-chn2 18704 1stcfb 23617 2ndcredom 23622 hauspwdom 23673 met1stc 24693 ovolctb2 25666 ovolfi 25668 ovoliunlem3 25678 uniiccdif 25752 dyadmbl 25774 mbfimaopnlem 25829 aannenlem3 26508 f1ocnt 33160 dmvlsiga 34532 sigapildsys 34565 omssubadd 34703 carsgclctunlem3 34723 pellex 43594 tr3dom 44286 nnfoctb 45800 nnf1oxpnn 45945 ioonct 46285 caragenunicl 47270 rrx2xpreen 49531 aacllem 50653 |
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