Theorem brcnvssr 39023

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 39017	. . 3 ⊢ Rel S
2	1	relbrcnv 6082	. 2 ⊢ (𝐴◡ S 𝐵 ↔ 𝐵 S 𝐴)
3		brssr 39018	. 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 2132   ⊆ wss 3895   class class class wbr 5090  ^◡ccnv 5635   S cssr 38623

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1805  ax-4 1819  ax-5 1920  ax-6 1977  ax-7 2018  ax-8 2134  ax-9 2142  ax-ext 2724  ax-sep 5236  ax-pr 5380

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 857  df-3an 1097  df-tru 1553  df-fal 1563  df-ex 1790  df-sb 2081  df-clab 2731  df-cleq 2744  df-clel 2827  df-ral 3067  df-rex 3077  df-rab 3405  df-v 3446  df-dif 3898  df-un 3900  df-in 3902  df-ss 3912  df-nul 4277  df-if 4471  df-sn 4573  df-pr 4575  df-op 4579  df-br 5091  df-opab 5153  df-xp 5642  df-rel 5643  df-cnv 5644  df-ssr 39015

This theorem is referenced by:  brcnvssrid  39024  br1cossxrncnvssrres  39025  dfcnvrefrels2  39045  dfcnvrefrels3  39046