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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 2024 | . 2 ⊢ (𝑥 = 𝑦 → 𝑦 = 𝑥) | |
2 | equcomi 2024 | . 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 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1781 |
This theorem is referenced by: equcomd 2026 equsb3rOLD 2111 dvelimhw 2366 nfeqf1 2397 eu1 2694 reu7 3725 reu8 3726 dfdif3 4093 issn 4765 iunid 4986 disjxun 5066 copsexgw 5383 copsexg 5384 opelopabsbALT 5418 dfid4 5463 dfid3 5464 opeliunxp 5621 dmi 5793 elidinxp 5913 opabresid 5919 opabresidOLD 5921 asymref2 5979 intirr 5980 cnvi 6002 coi1 6117 cnvso 6141 iotaval 6331 brprcneu 6664 dffv2 6758 fvn0ssdmfun 6844 f1oiso 7106 fsplit 7814 qsid 8365 mapsnend 8590 marypha2lem2 8902 fiinfg 8965 dfac5lem2 9552 dfac5lem3 9553 kmlem15 9592 brdom7disj 9955 suplem2pr 10477 wloglei 11174 fimaxre 11586 fimaxreOLD 11587 arch 11897 dflt2 12544 hashgt12el 13786 hashge2el2dif 13841 summo 15076 tosso 17648 opsrtoslem1 20266 mamulid 21052 mpomatmul 21057 mattpos1 21067 scmatscm 21124 1marepvmarrepid 21186 ist1-3 21959 unisngl 22137 fmid 22570 tgphaus 22727 dscopn 23185 iundisj2 24152 dvlip 24592 ply1divmo 24731 disjabrex 30334 disjabrexf 30335 iundisj2f 30342 iundisj2fi 30522 ordtconnlem1 31169 dfdm5 33018 dfrn5 33019 dffun10 33377 elfuns 33378 dfiota3 33386 brimg 33400 dfrdg4 33414 nn0prpwlem 33672 fvineqsneu 34694 wl-equsalcom 34784 wl-dfralflem 34840 matunitlindflem2 34891 pmapglb 36908 polval2N 37044 diclspsn 38332 eq0rabdioph 39380 ontric3g 39895 undmrnresiss 39971 relopabVD 41242 icheq 43627 ichexmpl1 43638 opeliun2xp 44388 itsclquadeu 44771 |
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