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Theorem eqvrelsym 38133
Description: An equivalence relation is symmetric. (Contributed by NM, 4-Jun-1995.) (Revised by Mario Carneiro, 12-Aug-2015.) (Revised by Peter Mazsa, 2-Jun-2019.)
Hypotheses
Ref Expression
eqvrelsym.1 (𝜑 → EqvRel 𝑅)
eqvrelsym.2 (𝜑𝐴𝑅𝐵)
Assertion
Ref Expression
eqvrelsym (𝜑𝐵𝑅𝐴)

Proof of Theorem eqvrelsym
StepHypRef Expression
1 eqvrelsym.2 . . 3 (𝜑𝐴𝑅𝐵)
2 eqvrelsym.1 . . . 4 (𝜑 → EqvRel 𝑅)
3 eqvrelrel 38125 . . . 4 ( EqvRel 𝑅 → Rel 𝑅)
4 relbrcnvg 6104 . . . 4 (Rel 𝑅 → (𝐵𝑅𝐴𝐴𝑅𝐵))
52, 3, 43syl 18 . . 3 (𝜑 → (𝐵𝑅𝐴𝐴𝑅𝐵))
61, 5mpbird 256 . 2 (𝜑𝐵𝑅𝐴)
7 eqvrelsymrel 38127 . . . 4 ( EqvRel 𝑅 → SymRel 𝑅)
8 dfsymrel2 38077 . . . . 5 ( SymRel 𝑅 ↔ (𝑅𝑅 ∧ Rel 𝑅))
98simplbi 496 . . . 4 ( SymRel 𝑅𝑅𝑅)
102, 7, 93syl 18 . . 3 (𝜑𝑅𝑅)
1110ssbrd 5186 . 2 (𝜑 → (𝐵𝑅𝐴𝐵𝑅𝐴))
126, 11mpd 15 1 (𝜑𝐵𝑅𝐴)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 205  wss 3939   class class class wbr 5143  ccnv 5671  Rel wrel 5677   SymRel wsymrel 37717   EqvRel weqvrel 37722
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1789  ax-4 1803  ax-5 1905  ax-6 1963  ax-7 2003  ax-8 2100  ax-9 2108  ax-ext 2696  ax-sep 5294  ax-nul 5301  ax-pr 5423
This theorem depends on definitions:  df-bi 206  df-an 395  df-or 846  df-3an 1086  df-tru 1536  df-fal 1546  df-ex 1774  df-sb 2060  df-clab 2703  df-cleq 2717  df-clel 2802  df-ral 3052  df-rex 3061  df-rab 3420  df-v 3465  df-dif 3942  df-un 3944  df-in 3946  df-ss 3956  df-nul 4319  df-if 4525  df-sn 4625  df-pr 4627  df-op 4631  df-br 5144  df-opab 5206  df-id 5570  df-xp 5678  df-rel 5679  df-cnv 5680  df-co 5681  df-dm 5682  df-rn 5683  df-res 5684  df-refrel 38040  df-symrel 38072  df-trrel 38102  df-eqvrel 38113
This theorem is referenced by:  eqvrelsymb  38134  eqvreltr4d  38137  eqvrelth  38139
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