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Mirrors > Home > MPE Home > Th. List > ensym | Structured version Visualization version GIF version |
Description: Symmetry of equinumerosity. Theorem 2 of [Suppes] p. 92. (Contributed by NM, 26-Oct-2003.) (Revised by Mario Carneiro, 26-Apr-2015.) |
Ref | Expression |
---|---|
ensym | ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ensymb 8557 | . 2 ⊢ (𝐴 ≈ 𝐵 ↔ 𝐵 ≈ 𝐴) | |
2 | 1 | biimpi 218 | 1 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 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: ensymi 8559 ensymd 8560 sbthb 8638 domnsym 8643 sdomdomtr 8650 domsdomtr 8652 enen1 8657 enen2 8658 domen1 8659 domen2 8660 sdomen1 8661 sdomen2 8662 domtriord 8663 xpen 8680 pwen 8690 nneneq 8700 php2 8702 php3 8703 phpeqd 8706 ominf 8730 fineqvlem 8732 en1eqsn 8748 dif1en 8751 enp1i 8753 findcard3 8761 isfinite2 8776 nnsdomg 8777 domunfican 8791 infcntss 8792 fiint 8795 wdomen1 9040 wdomen2 9041 unxpwdom2 9052 karden 9324 finnum 9377 carden2b 9396 fidomtri2 9423 cardmin2 9427 pr2ne 9431 en2eleq 9434 infxpenlem 9439 acnen 9479 acnen2 9481 infpwfien 9488 alephordi 9500 alephinit 9521 dfac12lem2 9570 dfac12r 9572 undjudom 9593 djucomen 9603 djuinf 9614 pwsdompw 9626 infmap2 9640 ackbij1b 9661 cflim2 9685 fin4en1 9731 domfin4 9733 fin23lem25 9746 fin23lem23 9748 enfin1ai 9806 fin67 9817 isfin7-2 9818 fin1a2lem11 9832 axcc2lem 9858 axcclem 9879 numthcor 9916 carden 9973 sdomsdomcard 9982 canthnum 10071 canthwe 10073 canthp1lem2 10075 canthp1 10076 pwxpndom2 10087 gchdjuidm 10090 gchxpidm 10091 gchpwdom 10092 inawinalem 10111 grudomon 10239 isfinite4 13724 hashfn 13737 ramub2 16350 dfod2 18691 sylow2blem1 18745 znhash 20705 hauspwdom 22109 rectbntr0 23440 ovolctb 24091 dyadmbl 24201 eupthfi 27984 derangen 32419 finminlem 33666 domalom 34688 phpreu 34891 pellexlem4 39449 pellexlem5 39450 pellex 39452 |
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