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| Mirrors > Home > MPE Home > Th. List > funcnvres2 | Structured version Visualization version GIF version | ||
| Description: The converse of a restriction of the converse of a function equals the function restricted to the image of its converse. (Contributed by NM, 4-May-2005.) |
| Ref | Expression |
|---|---|
| funcnvres2 | ⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (𝐹 ↾ (◡𝐹 “ 𝐴))) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funcnvcnv 6559 | . . 3 ⊢ (Fun 𝐹 → Fun ◡◡𝐹) | |
| 2 | funcnvres 6570 | . . 3 ⊢ (Fun ◡◡𝐹 → ◡(◡𝐹 ↾ 𝐴) = (◡◡𝐹 ↾ (◡𝐹 “ 𝐴))) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (◡◡𝐹 ↾ (◡𝐹 “ 𝐴))) |
| 4 | funrel 6509 | . . . 4 ⊢ (Fun 𝐹 → Rel 𝐹) | |
| 5 | dfrel2 6147 | . . . 4 ⊢ (Rel 𝐹 ↔ ◡◡𝐹 = 𝐹) | |
| 6 | 4, 5 | sylib 218 | . . 3 ⊢ (Fun 𝐹 → ◡◡𝐹 = 𝐹) |
| 7 | 6 | reseq1d 5937 | . 2 ⊢ (Fun 𝐹 → (◡◡𝐹 ↾ (◡𝐹 “ 𝐴)) = (𝐹 ↾ (◡𝐹 “ 𝐴))) |
| 8 | 3, 7 | eqtrd 2771 | 1 ⊢ (Fun 𝐹 → ◡(◡𝐹 ↾ 𝐴) = (𝐹 ↾ (◡𝐹 “ 𝐴))) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ◡ccnv 5623 ↾ cres 5626 “ cima 5627 Rel wrel 5629 Fun wfun 6486 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2115 ax-9 2123 ax-12 2184 ax-ext 2708 ax-sep 5241 ax-nul 5251 ax-pr 5377 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-sb 2068 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3061 df-rab 3400 df-v 3442 df-dif 3904 df-un 3906 df-in 3908 df-ss 3918 df-nul 4286 df-if 4480 df-sn 4581 df-pr 4583 df-op 4587 df-br 5099 df-opab 5161 df-id 5519 df-xp 5630 df-rel 5631 df-cnv 5632 df-co 5633 df-dm 5634 df-rn 5635 df-res 5636 df-ima 5637 df-fun 6494 |
| This theorem is referenced by: funimacnv 6573 foimacnv 6791 unbenlem 16836 ofco2 22395 dvlog 26616 fresf1o 32709 fressupp 32767 |
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