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Theorem elsymrels4 36596
Description: Element of the class of symmetric relations. (Contributed by Peter Mazsa, 17-Aug-2021.)
Assertion
Ref Expression
elsymrels4 (𝑅 ∈ SymRels ↔ (𝑅 = 𝑅𝑅 ∈ Rels ))

Proof of Theorem elsymrels4
Dummy variable 𝑟 is distinct from all other variables.
StepHypRef Expression
1 dfsymrels4 36588 . 2 SymRels = {𝑟 ∈ Rels ∣ 𝑟 = 𝑟}
2 cnveq 5771 . . 3 (𝑟 = 𝑅𝑟 = 𝑅)
3 id 22 . . 3 (𝑟 = 𝑅𝑟 = 𝑅)
42, 3eqeq12d 2754 . 2 (𝑟 = 𝑅 → (𝑟 = 𝑟𝑅 = 𝑅))
51, 4rabeqel 36321 1 (𝑅 ∈ SymRels ↔ (𝑅 = 𝑅𝑅 ∈ Rels ))
Colors of variables: wff setvar class
Syntax hints:  wb 205  wa 395   = wceq 1539  wcel 2108  ccnv 5579   Rels crels 36262   SymRels csymrels 36271
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-sep 5218  ax-nul 5225  ax-pr 5347
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-clab 2716  df-cleq 2730  df-clel 2817  df-ral 3068  df-rex 3069  df-rab 3072  df-v 3424  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-op 4565  df-br 5071  df-opab 5133  df-xp 5586  df-rel 5587  df-cnv 5588  df-dm 5590  df-rn 5591  df-res 5592  df-rels 36530  df-ssr 36543  df-syms 36583  df-symrels 36584
This theorem is referenced by: (None)
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