Theorem cnvrefrelcoss2 39080

Description: Necessary and sufficient condition for a coset relation to be a converse reflexive relation. (Contributed by Peter Mazsa, 27-Jul-2021.)

Assertion

Ref	Expression
cnvrefrelcoss2	⊢ ( CnvRefRel ≀ 𝑅 ↔ ≀ 𝑅 ⊆ I )

Proof of Theorem cnvrefrelcoss2

Step	Hyp	Ref	Expression
1		relcoss 38976	. . 3 ⊢ Rel ≀ 𝑅
2		dfcnvrefrel2 39073	. . 3 ⊢ ( CnvRefRel ≀ 𝑅 ↔ ( ≀ 𝑅 ⊆ ( I ∩ (dom ≀ 𝑅 × ran ≀ 𝑅)) ∧ Rel ≀ 𝑅))
3	1, 2	mpbiran2 720	. 2 ⊢ ( CnvRefRel ≀ 𝑅 ↔ ≀ 𝑅 ⊆ ( I ∩ (dom ≀ 𝑅 × ran ≀ 𝑅)))
4		cossssid 39020	. 2 ⊢ ( ≀ 𝑅 ⊆ I ↔ ≀ 𝑅 ⊆ ( I ∩ (dom ≀ 𝑅 × ran ≀ 𝑅)))
5	3, 4	bitr4i 280	1 ⊢ ( CnvRefRel ≀ 𝑅 ↔ ≀ 𝑅 ⊆ I )

Syntax hints:   ↔ wb 208   ∩ cin 3903   ⊆ wss 3904   I cid 5539   × cxp 5643  dom cdm 5645  ran crn 5646  Rel wrel 5650   ≀ ccoss 38646   CnvRefRel wcnvrefrel 38655

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1814  ax-4 1828  ax-5 1929  ax-6 1986  ax-7 2027  ax-8 2143  ax-9 2151  ax-11 2190  ax-ext 2733  ax-sep 5245  ax-pr 5389

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1099  df-tru 1562  df-fal 1572  df-ex 1799  df-sb 2090  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3076  df-rex 3086  df-rab 3414  df-v 3455  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4480  df-sn 4582  df-pr 4584  df-op 4588  df-br 5100  df-opab 5162  df-id 5540  df-xp 5651  df-rel 5652  df-cnv 5653  df-co 5654  df-dm 5655  df-rn 5656  df-res 5657  df-coss 38964  df-cnvrefrel 39070

This theorem is referenced by:  dffunALTV2  39236  funALTVfun  39246  dfdisjALTV2  39262