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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 8004 | . 2 ⊢ (𝐴 ≈ 𝐵 ↔ 𝐵 ≈ 𝐴) | |
2 | 1 | biimpi 206 | 1 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 class class class wbr 4653 ≈ cen 7952 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-8 1992 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pow 4843 ax-pr 4906 ax-un 6949 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-nul 3916 df-if 4087 df-pw 4160 df-sn 4178 df-pr 4180 df-op 4184 df-uni 4437 df-br 4654 df-opab 4713 df-id 5024 df-xp 5120 df-rel 5121 df-cnv 5122 df-co 5123 df-dm 5124 df-rn 5125 df-res 5126 df-ima 5127 df-fun 5890 df-fn 5891 df-f 5892 df-f1 5893 df-fo 5894 df-f1o 5895 df-er 7742 df-en 7956 |
This theorem is referenced by: ensymi 8006 ensymd 8007 sbthb 8081 domnsym 8086 sdomdomtr 8093 domsdomtr 8095 enen1 8100 enen2 8101 domen1 8102 domen2 8103 sdomen1 8104 sdomen2 8105 domtriord 8106 xpen 8123 pwen 8133 nneneq 8143 php2 8145 php3 8146 ominf 8172 fineqvlem 8174 en1eqsn 8190 dif1en 8193 enp1i 8195 findcard3 8203 isfinite2 8218 nnsdomg 8219 domunfican 8233 infcntss 8234 fiint 8237 wdomen1 8481 wdomen2 8482 unxpwdom2 8493 karden 8758 finnum 8774 carden2b 8793 fidomtri2 8820 cardmin2 8824 pr2ne 8828 en2eleq 8831 infxpenlem 8836 acnen 8876 acnen2 8878 infpwfien 8885 alephordi 8897 alephinit 8918 dfac12lem2 8966 dfac12r 8968 uncdadom 8993 cdacomen 9003 cdainf 9014 pwsdompw 9026 infmap2 9040 ackbij1b 9061 cflim2 9085 fin4en1 9131 domfin4 9133 fin23lem25 9146 fin23lem23 9148 enfin1ai 9206 fin67 9217 isfin7-2 9218 fin1a2lem11 9232 axcc2lem 9258 axcclem 9279 numthcor 9316 carden 9373 sdomsdomcard 9382 canthnum 9471 canthwe 9473 canthp1lem2 9475 canthp1 9476 pwxpndom2 9487 gchcdaidm 9490 gchxpidm 9491 gchpwdom 9492 inawinalem 9511 grudomon 9639 isfinite4 13153 hashfn 13164 ramub2 15718 dfod2 17981 sylow2blem1 18035 znhash 19907 hauspwdom 21304 rectbntr0 22635 ovolctb 23258 dyadmbl 23368 eupthfi 27065 derangen 31154 finminlem 32312 phpreu 33393 pellexlem4 37396 pellexlem5 37397 pellex 37399 |
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