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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 9013 | . 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 5107 ≈ cen 8953 |
| 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 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2215 ax-ext 2734 ax-sep 5255 ax-pow 5334 ax-pr 5402 ax-un 7740 |
| 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 2566 df-eu 2596 df-clab 2741 df-cleq 2754 df-clel 2837 df-nfc 2911 df-ral 3079 df-rex 3089 df-rab 3415 df-v 3455 df-dif 3905 df-un 3907 df-in 3909 df-ss 3919 df-nul 4283 df-if 4486 df-pw 4562 df-sn 4588 df-pr 4590 df-op 4594 df-uni 4871 df-br 5108 df-opab 5172 df-id 5554 df-xp 5665 df-rel 5666 df-cnv 5667 df-co 5668 df-dm 5669 df-rn 5670 df-res 5671 df-ima 5672 df-fun 6539 df-fn 6540 df-f 6541 df-f1 6542 df-fo 6543 df-f1o 6544 df-er 8700 df-en 8957 |
| This theorem is used by: entr2i 9019 entr3i 9020 entr4i 9021 pm54.43 10010 infxpenlem 10020 unsnen 10565 cfpwsdom 10597 tskinf 10782 inar1 10788 gruina 10831 uzenom 14032 znnen 16306 qnnen 16307 rexpen 16322 rucALT 16324 aleph1re 16339 aleph1irr 16340 unben 17007 ex-chn2 18732 1stcfb 23676 2ndcredom 23681 hauspwdom 23733 met1stc 24753 ovolctb2 25726 ovolfi 25728 ovoliunlem3 25738 uniiccdif 25812 dyadmbl 25834 mbfimaopnlem 25889 aannenlem3 26573 f1ocnt 33279 dmvlsiga 34647 sigapildsys 34681 omssubadd 34819 carsgclctunlem3 34839 pellex 43684 tr3dom 44376 nnfoctb 45890 nnf1oxpnn 46035 ioonct 46375 caragenunicl 47360 rrx2xpreen 49657 aacllem 50780 |
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