![]() |
Metamath Proof Explorer |
< Previous
Next >
Nearby theorems |
|
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 212 | 1 ⊢ (𝑥 = 𝑦 ↔ 𝑦 = 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 209 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1911 ax-6 1970 ax-7 2015 |
This theorem depends on definitions: df-bi 210 df-an 400 df-ex 1782 |
This theorem is referenced by: equcomd 2026 equsb3rOLD 2108 dvelimhw 2355 nfeqf1 2386 eu1 2671 reu7 3671 reu8 3672 dfdif3 4042 issn 4723 iunid 4947 disjxun 5028 copsexgw 5346 copsexg 5347 opelopabsbALT 5381 dfid4 5426 dfid3 5427 opeliunxp 5583 dmi 5755 elidinxp 5878 opabresid 5884 opabresidOLD 5886 asymref2 5944 intirr 5945 cnvi 5967 coi1 6082 cnvso 6107 iotaval 6298 brprcneu 6637 dffv2 6733 fvn0ssdmfun 6819 f1oiso 7083 fvmpopr2d 7290 fsplit 7795 qsid 8346 mapsnend 8571 marypha2lem2 8884 fiinfg 8947 dfac5lem2 9535 dfac5lem3 9536 kmlem15 9575 brdom7disj 9942 suplem2pr 10464 wloglei 11161 fimaxre 11573 arch 11882 dflt2 12529 hashgt12el 13779 hashge2el2dif 13834 summo 15066 tosso 17638 opsrtoslem1 20723 mamulid 21046 mpomatmul 21051 mattpos1 21061 scmatscm 21118 1marepvmarrepid 21180 ist1-3 21954 unisngl 22132 fmid 22565 tgphaus 22722 dscopn 23180 iundisj2 24153 dvlip 24596 ply1divmo 24736 disjabrex 30345 disjabrexf 30346 iundisj2f 30353 iundisj2fi 30546 ordtconnlem1 31277 dfdm5 33129 dfrn5 33130 dffun10 33488 elfuns 33489 dfiota3 33497 brimg 33511 dfrdg4 33525 nn0prpwlem 33783 fvineqsneu 34828 wl-equsalcom 34947 wl-dfralflem 35003 matunitlindflem2 35054 pmapglb 37066 polval2N 37202 diclspsn 38490 eq0rabdioph 39717 ontric3g 40230 undmrnresiss 40304 relopabVD 41607 icheq 43979 ichexmpl1 43986 opeliun2xp 44734 itsclquadeu 45191 |
Copyright terms: Public domain | W3C validator |