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| Mirrors > Home > MPE Home > Th. List > fimacnv | Structured version Visualization version GIF version | ||
| Description: The preimage of the codomain of a function is the function's domain. (Contributed by FL, 25-Jan-2007.) (Proof shortened by AV, 20-Sep-2024.) |
| Ref | Expression |
|---|---|
| fimacnv | ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | frn 6658 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 2 | cnvimassrndm 6099 | . . 3 ⊢ (ran 𝐹 ⊆ 𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) |
| 4 | fdm 6660 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) | |
| 5 | 3, 4 | eqtrd 2766 | 1 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ⊆ wss 3897 ◡ccnv 5613 dom cdm 5614 ran crn 5615 “ cima 5617 ⟶wf 6477 |
| 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 2113 ax-9 2121 ax-10 2144 ax-12 2180 ax-ext 2703 ax-sep 5232 ax-nul 5242 ax-pr 5368 |
| 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-nf 1785 df-sb 2068 df-clab 2710 df-cleq 2723 df-clel 2806 df-ral 3048 df-rex 3057 df-rab 3396 df-v 3438 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-nul 4281 df-if 4473 df-sn 4574 df-pr 4576 df-op 4580 df-br 5090 df-opab 5152 df-xp 5620 df-cnv 5622 df-dm 5624 df-rn 5625 df-res 5626 df-ima 5627 df-fn 6484 df-f 6485 |
| This theorem is referenced by: fco 6675 f1co 6730 fimacnvinrn 7004 fmpt 7043 fsuppeq 8105 fsuppeqg 8106 fin1a2lem7 10297 cnclima 23183 iscncl 23184 cnindis 23207 cncmp 23307 ptrescn 23554 qtopuni 23617 qtopcld 23628 qtopcmap 23634 ordthmeolem 23716 rnelfmlem 23867 mbfdm 25554 ismbf 25556 mbfimaicc 25559 ismbf2d 25568 ismbf3d 25582 mbfimaopn2 25585 i1fd 25609 plyeq0 26143 elrspunidl 33393 fsumcvg4 33963 zrhunitpreima 33989 imambfm 34275 carsggect 34331 dstrvprob 34485 poimirlem30 37689 dvtan 37709 smfresal 46885 cnneiima 49016 |
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