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Related theorems GIF version |
| Description: Equality theorem for converse. |
| Ref | Expression |
|---|---|
| cnveq | ⊢ (A = B → ◡A = ◡B) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cnvss 2512 | . . 3 ⊢ (A ⊆ B → ◡A ⊆ ◡B) | |
| 2 | cnvss 2512 | . . 3 ⊢ (B ⊆ A → ◡B ⊆ ◡A) | |
| 3 | 1, 2 | anim12i 268 | . 2 ⊢ ((A ⊆ B ∧ B ⊆ A) → (◡A ⊆ ◡B ∧ ◡B ⊆ ◡A)) |
| 4 | eqss 1516 | . 2 ⊢ (A = B ↔ (A ⊆ B ∧ B ⊆ A)) | |
| 5 | eqss 1516 | . 2 ⊢ (◡A = ◡B ↔ (◡A ⊆ ◡B ∧ ◡B ⊆ ◡A)) | |
| 6 | 3, 4, 5 | 3imtr4 192 | 1 ⊢ (A = B → ◡A = ◡B) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ∧ wa 196 = wceq 1091 ⊆ wss 1487 ◡ccnv 2409 |
| This theorem is referenced by: rneq 2555 xp0 2652 cnvcnv 2661 co01 2664 coi2 2666 funcnvuni 2706 f1eq1 2776 f1o00 2823 tz7.48-2 2995 abianfp 3000 ereq 3206 xpcomen 3343 sbthlem8 3356 zornlem4 3606 seqval 4665 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-7 676 ax-gen 677 ax-8 798 ax-9 799 ax-10 800 ax-11 801 ax-12 802 ax-13 804 ax-14 805 ax-16 922 ax-17 925 ax-ext 1074 ax-rep 1075 ax-pow 1077 |
| This theorem depends on definitions: df-bi 128 df-or 197 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 df-dif 1489 df-un 1490 df-in 1491 df-ss 1492 df-nul 1708 df-pw 1799 df-sn 1811 df-pr 1812 df-op 1815 df-br 2063 df-opab 2098 df-cnv 2426 |