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Theorem elsymrels2 39346
Description: Element of the class of symmetric relations. (Contributed by Peter Mazsa, 17-Aug-2021.)
Assertion
Ref Expression
elsymrels2 (𝑅 ∈ SymRels ↔ (𝑅𝑅𝑅 ∈ Rels ))

Proof of Theorem elsymrels2
Dummy variable 𝑟 is distinct from all other variables.
StepHypRef Expression
1 dfsymrels2 39334 . 2 SymRels = {𝑟 ∈ Rels ∣ 𝑟𝑟}
2 cnveq 5861 . . 3 (𝑟 = 𝑅𝑟 = 𝑅)
3 id 23 . . 3 (𝑟 = 𝑅𝑟 = 𝑅)
42, 3sseq12d 3971 . 2 (𝑟 = 𝑅 → (𝑟𝑟𝑅𝑅))
51, 4rabeqel 38966 1 (𝑅 ∈ SymRels ↔ (𝑅𝑅𝑅 ∈ Rels ))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wb 209  wa 401   = wceq 1570  wcel 2146  wss 3906  ccnv 5662   Rels crels 38894   SymRels csymrels 38903
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2148  ax-9 2156  ax-ext 2737  ax-sep 5259  ax-pr 5406
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-clab 2744  df-cleq 2757  df-clel 2840  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-xp 5669  df-rel 5670  df-cnv 5671  df-dm 5673  df-rn 5674  df-res 5675  df-rels 39149  df-ssr 39287  df-syms 39331  df-symrels 39332
This theorem is used by:  elsymrelsrel  39350
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