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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 8558 | . 2 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
3 | 1, 2 | ax-mp 5 | 1 ⊢ 𝐵 ≈ 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: class class class wbr 5066 ≈ cen 8506 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2793 ax-sep 5203 ax-nul 5210 ax-pow 5266 ax-pr 5330 ax-un 7461 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-mo 2622 df-eu 2654 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3939 df-un 3941 df-in 3943 df-ss 3952 df-nul 4292 df-if 4468 df-pw 4541 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4839 df-br 5067 df-opab 5129 df-id 5460 df-xp 5561 df-rel 5562 df-cnv 5563 df-co 5564 df-dm 5565 df-rn 5566 df-res 5567 df-ima 5568 df-fun 6357 df-fn 6358 df-f 6359 df-f1 6360 df-fo 6361 df-f1o 6362 df-er 8289 df-en 8510 |
This theorem is referenced by: entr2i 8564 entr3i 8565 entr4i 8566 pm54.43 9429 infxpenlem 9439 unsnen 9975 cfpwsdom 10006 tskinf 10191 inar1 10197 gruina 10240 uzenom 13333 znnen 15565 qnnen 15566 rexpen 15581 rucALT 15583 aleph1re 15598 aleph1irr 15599 unben 16245 1stcfb 22053 2ndcredom 22058 hauspwdom 22109 met1stc 23131 ovolctb2 24093 ovolfi 24095 ovoliunlem3 24105 uniiccdif 24179 dyadmbl 24201 mbfimaopnlem 24256 aannenlem3 24919 f1ocnt 30525 dmvlsiga 31388 sigapildsys 31421 omssubadd 31558 carsgclctunlem3 31578 pellex 39452 tr3dom 39914 nnfoctb 41329 nnf1oxpnn 41477 ioonct 41833 caragenunicl 42826 rrx2xpreen 44726 aacllem 44922 |
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