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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 6667 | . . 3 ⊢ (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵) | |
| 2 | cnvimassrndm 6108 | . . 3 ⊢ (ran 𝐹 ⊆ 𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) | |
| 3 | 1, 2 | syl 17 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = dom 𝐹) |
| 4 | fdm 6669 | . 2 ⊢ (𝐹:𝐴⟶𝐵 → dom 𝐹 = 𝐴) | |
| 5 | 3, 4 | eqtrd 2769 | 1 ⊢ (𝐹:𝐴⟶𝐵 → (◡𝐹 “ 𝐵) = 𝐴) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 = wceq 1541 ⊆ wss 3899 ◡ccnv 5621 dom cdm 5622 ran crn 5623 “ cima 5625 ⟶wf 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-ext 2706 ax-sep 5239 ax-nul 5249 ax-pr 5375 |
| 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-clab 2713 df-cleq 2726 df-clel 2809 df-ral 3050 df-rex 3059 df-rab 3398 df-v 3440 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4284 df-if 4478 df-sn 4579 df-pr 4581 df-op 4585 df-br 5097 df-opab 5159 df-xp 5628 df-cnv 5630 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-fn 6493 df-f 6494 |
| This theorem is referenced by: fco 6684 f1co 6739 fimacnvinrn 7014 fmpt 7053 fsuppeq 8115 fsuppeqg 8116 fin1a2lem7 10314 cnclima 23210 iscncl 23211 cnindis 23234 cncmp 23334 ptrescn 23581 qtopuni 23644 qtopcld 23655 qtopcmap 23661 ordthmeolem 23743 rnelfmlem 23894 mbfdm 25581 ismbf 25583 mbfimaicc 25586 ismbf2d 25595 ismbf3d 25609 mbfimaopn2 25612 i1fd 25636 plyeq0 26170 elrspunidl 33458 fsumcvg4 34056 zrhunitpreima 34082 imambfm 34368 carsggect 34424 dstrvprob 34578 poimirlem30 37790 dvtan 37810 smfresal 46974 cnneiima 49104 |
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