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Mirrors > Home > MPE Home > Th. List > equcom | Structured version Visualization version GIF version |
Description: Commutative law for equality. Equality is a symmetric relation. (Contributed by NM, 20-Aug-1993.) |
Ref | Expression |
---|---|
equcom | ⊢ (𝑥 = 𝑦 ↔ 𝑦 = 𝑥) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | equcomi 2020 | . 2 ⊢ (𝑥 = 𝑦 → 𝑦 = 𝑥) | |
2 | equcomi 2020 | . 2 ⊢ (𝑦 = 𝑥 → 𝑥 = 𝑦) | |
3 | 1, 2 | impbii 211 | 1 ⊢ (𝑥 = 𝑦 ↔ 𝑦 = 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 208 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 |
This theorem is referenced by: equcomd 2022 equsb3rOLD 2107 dvelimhw 2362 nfeqf1 2393 eu1 2690 reu7 3722 reu8 3723 dfdif3 4090 issn 4756 iunid 4976 disjxun 5056 copsexgw 5373 copsexg 5374 opelopabsbALT 5408 dfid4 5455 dfid3 5456 opeliunxp 5613 dmi 5785 elidinxp 5905 opabresid 5911 opabresidOLD 5913 asymref2 5971 intirr 5972 cnvi 5994 coi1 6109 cnvso 6133 iotaval 6323 brprcneu 6656 dffv2 6750 fvn0ssdmfun 6836 f1oiso 7098 fsplit 7806 qsid 8357 mapsnend 8582 marypha2lem2 8894 fiinfg 8957 dfac5lem2 9544 dfac5lem3 9545 kmlem15 9584 brdom7disj 9947 suplem2pr 10469 wloglei 11166 fimaxre 11578 fimaxreOLD 11579 arch 11888 dflt2 12535 hashgt12el 13777 hashge2el2dif 13832 summo 15068 tosso 17640 opsrtoslem1 20258 mamulid 21044 mpomatmul 21049 mattpos1 21059 scmatscm 21116 1marepvmarrepid 21178 ist1-3 21951 unisngl 22129 fmid 22562 tgphaus 22719 dscopn 23177 iundisj2 24144 dvlip 24584 ply1divmo 24723 disjabrex 30326 disjabrexf 30327 iundisj2f 30334 iundisj2fi 30514 ordtconnlem1 31162 dfdm5 33011 dfrn5 33012 dffun10 33370 elfuns 33371 dfiota3 33379 brimg 33393 dfrdg4 33407 nn0prpwlem 33665 fvineqsneu 34686 wl-equsalcom 34776 wl-dfralflem 34832 matunitlindflem2 34883 pmapglb 36900 polval2N 37036 diclspsn 38324 eq0rabdioph 39366 ontric3g 39881 undmrnresiss 39957 relopabVD 41228 icheq 43614 ichexmpl1 43625 opeliun2xp 44375 itsclquadeu 44758 |
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