| Mathbox for Peter Mazsa |
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| Mirrors > Home > MPE Home > Th. List > Mathboxes > brcnvssr | Structured version Visualization version GIF version | ||
| Description: The converse of a subset relation swaps arguments. (Contributed by Peter Mazsa, 1-Aug-2019.) |
| Ref | Expression |
|---|---|
| brcnvssr | ⊢ (𝐴 ∈ 𝑉 → (𝐴◡ S 𝐵 ↔ 𝐵 ⊆ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | relssr 39514 | . . 3 ⊢ Rel S | |
| 2 | 1 | relbrcnv 6103 | . 2 ⊢ (𝐴◡ S 𝐵 ↔ 𝐵 S 𝐴) |
| 3 | brssr 39515 | . 2 ⊢ (𝐴 ∈ 𝑉 → (𝐵 S 𝐴 ↔ 𝐵 ⊆ 𝐴)) | |
| 4 | 2, 3 | bitrid 286 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐴◡ S 𝐵 ↔ 𝐵 ⊆ 𝐴)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 ∈ wcel 2145 ⊆ wss 3914 class class class wbr 5103 ◡ccnv 5650 S cssr 39120 |
| 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 2147 ax-9 2155 ax-ext 2733 ax-sep 5249 ax-pr 5391 |
| 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 2740 df-cleq 2753 df-clel 2836 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3900 df-un 3902 df-in 3904 df-ss 3915 df-nul 4280 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-br 5104 df-opab 5168 df-xp 5657 df-rel 5658 df-cnv 5659 df-ssr 39512 |
| This theorem is used by: brcnvssrid 39521 br1cossxrncnvssrres 39522 dfcnvrefrels2 39542 dfcnvrefrels3 39543 |
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