Theorem brcnvssr 39090

Description: The converse of a subset relation swaps arguments. (Contributed by Peter Mazsa, 1-Aug-2019.)

Assertion

Ref	Expression
brcnvssr	⊢ (𝐴 ∈ 𝑉 → (𝐴◡ S 𝐵 ↔ 𝐵 ⊆ 𝐴))

Proof of Theorem brcnvssr

Step	Hyp	Ref	Expression
1		relssr 39084	. . 3 ⊢ Rel S
2	1	relbrcnv 6096	. 2 ⊢ (𝐴◡ S 𝐵 ↔ 𝐵 S 𝐴)
3		brssr 39085	. 2 ⊢ (𝐴 ∈ 𝑉 → (𝐵 S 𝐴 ↔ 𝐵 ⊆ 𝐴))
4	2, 3	bitrid 285	1 ⊢ (𝐴 ∈ 𝑉 → (𝐴◡ S 𝐵 ↔ 𝐵 ⊆ 𝐴))

Syntax hints:   → wi 4   ↔ wb 208   ∈ wcel 2143   ⊆ wss 3905   class class class wbr 5101  ^◡ccnv 5647   S cssr 38690

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1816  ax-4 1830  ax-5 1931  ax-6 1988  ax-7 2029  ax-8 2145  ax-9 2153  ax-ext 2735  ax-sep 5247  ax-pr 5391

This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1101  df-tru 1564  df-fal 1574  df-ex 1801  df-sb 2092  df-clab 2742  df-cleq 2755  df-clel 2838  df-ral 3078  df-rex 3088  df-rab 3416  df-v 3457  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-br 5102  df-opab 5164  df-xp 5654  df-rel 5655  df-cnv 5656  df-ssr 39082

This theorem is referenced by:  brcnvssrid  39091  br1cossxrncnvssrres  39092  dfcnvrefrels2  39112  dfcnvrefrels3  39113