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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 6718 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 2 | cnvimassrndm 6151 | . . 3 ⊢ (ran 𝐹 ⊆ 𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) | |
| 3 | 1, 2 | syl 18 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) |
| 4 | fdm 6720 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) | |
| 5 | 3, 4 | eqtrd 2800 | 1 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ⊆ wss 3906 ◡ccnv 5662 dom cdm 5663 ran crn 5664 “ cima 5666 ⟶wf 6537 |
| 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 2148 ax-9 2156 ax-ext 2737 ax-sep 5259 ax-pr 5406 |
| 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 2744 df-cleq 2757 df-clel 2840 df-ral 3082 df-rex 3092 df-rab 3419 df-v 3459 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4287 df-if 4490 df-sn 4592 df-pr 4594 df-op 4598 df-br 5112 df-opab 5176 df-xp 5669 df-cnv 5671 df-dm 5673 df-rn 5674 df-res 5675 df-ima 5676 df-fn 6544 df-f 6545 |
| This theorem is used by: fco 6735 f1co 6792 fimacnvinrn 7071 fmpt 7110 fsuppeq 8178 fsuppeqg 8179 fin1a2lem7 10406 cnclima 23480 iscncl 23481 cnindis 23504 cncmp 23604 ptrescn 23852 qtopuni 23915 qtopcld 23926 qtopcmap 23932 ordthmeolem 24014 rnelfmlem 24165 mbfdm 25841 ismbf 25843 mbfimaicc 25846 ismbf2d 25855 ismbf3d 25869 mbfimaopn2 25872 i1fd 25896 plyeq0 26424 elrspunidl 33805 fsumcvg4 34409 zrhunitpreima 34435 imambfm 34722 carsggect 34778 dstrvprob 34932 poimirlem30 38363 dvtan 38383 smfresal 47580 cnneiima 49772 |
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