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 1931 | . 2 ⊢ (𝑥 = 𝑦 → 𝑦 = 𝑥) | |
2 | equcomi 1931 | . 2 ⊢ (𝑦 = 𝑥 → 𝑥 = 𝑦) | |
3 | 1, 2 | impbii 198 | 1 ⊢ (𝑥 = 𝑦 ↔ 𝑦 = 𝑥) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 195 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 |
This theorem depends on definitions: df-bi 196 df-an 385 df-ex 1696 |
This theorem is referenced by: equcomd 1933 equequ2OLD 1942 dvelimhw 2159 nfeqf1 2287 eu1 2498 reu7 3368 reu8 3369 issn 4303 iunid 4511 disjxun 4581 copsexg 4882 opelopabsbALT 4909 dfid3 4954 dfid4 4955 opeliunxp 5093 dmi 5261 opabresid 5374 restidsingOLD 5378 asymref2 5432 intirr 5433 cnvi 5456 coi1 5568 cnvso 5591 brprcneu 6096 dffv2 6181 fvn0ssdmfun 6258 f1oiso 6501 qsid 7700 mapsnen 7920 marypha2lem2 8225 fiinfg 8288 dfac5lem2 8830 dfac5lem3 8831 kmlem15 8869 brdom7disj 9234 suplem2pr 9754 wloglei 10439 fimaxre 10847 arch 11166 dflt2 11857 hashgt12el 13070 hashge2el2dif 13117 summo 14295 tosso 16859 opsrtoslem1 19305 mamulid 20066 mpt2matmul 20071 mattpos1 20081 scmatscm 20138 1marepvmarrepid 20200 ist1-3 20963 unisngl 21140 cnmptid 21274 fmid 21574 tgphaus 21730 dscopn 22188 iundisj2 23124 dvlip 23560 ply1divmo 23699 frg2wot1 26584 disjabrex 28777 disjabrexf 28778 iundisj2f 28785 iundisj2fi 28943 ordtconlem1 29298 dfdm5 30921 dfrn5 30922 dffun10 31191 elfuns 31192 dfiota3 31200 brimg 31214 dfrdg4 31228 nn0prpwlem 31487 bj-ssbequ2 31832 wl-equsalcom 32507 matunitlindflem2 32576 pmapglb 34074 polval2N 34210 diclspsn 35501 eq0rabdioph 36358 undmrnresiss 36929 relopabVD 38159 mapsnend 38386 frgr2wwlk1 41494 opeliun2xp 41904 |
Copyright terms: Public domain | W3C validator |