Theorem dfsymrels4 39204

Description: Alternate definition of the class of symmetric relations. (Contributed by Peter Mazsa, 20-Jul-2019.)

Assertion

Ref	Expression
dfsymrels4	⊢ SymRels = {𝑟 ∈ Rels ∣ ◡𝑟 = 𝑟}

Proof of Theorem dfsymrels4

Step	Hyp	Ref	Expression
1		dfsymrels2 39198	. 2 ⊢ SymRels = {𝑟 ∈ Rels ∣ ◡𝑟 ⊆ 𝑟}
2		elrelscnveq 39201	. 2 ⊢ (𝑟 ∈ Rels → (◡𝑟 ⊆ 𝑟 ↔ ◡𝑟 = 𝑟))
3	1, 2	rabimbieq 38826	1 ⊢ SymRels = {𝑟 ∈ Rels ∣ ◡𝑟 = 𝑟}

Syntax hints:   = wceq 1567  {crab 3423   ⊆ wss 3913  ^◡ccnv 5661   Rels crels 38758   SymRels csymrels 38767

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-ext 2741  ax-sep 5261  ax-pr 5405

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-sb 2098  df-clab 2748  df-cleq 2761  df-clel 2844  df-ral 3086  df-rex 3096  df-rab 3424  df-v 3465  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-nul 4295  df-if 4493  df-pw 4569  df-sn 4595  df-pr 4597  df-op 4601  df-br 5114  df-opab 5178  df-xp 5668  df-rel 5669  df-cnv 5670  df-dm 5672  df-rn 5673  df-res 5674  df-rels 39013  df-ssr 39151  df-syms 39195  df-symrels 39196

This theorem is referenced by:  dfsymrels5  39205  elsymrels4  39212