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| Mirrors > Home > MPE Home > Th. List > fcoi2 | Structured version Visualization version GIF version | ||
| Description: Composition of restricted identity and a mapping. (Contributed by NM, 13-Dec-2003.) (Proof shortened by Andrew Salmon, 17-Sep-2011.) |
| Ref | Expression |
|---|---|
| fcoi2 | ⊢ (𝐹:𝐴⟶𝐵 → (( I ↾ 𝐵) ∘ 𝐹) = 𝐹) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-f 6547 | . 2 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) | |
| 2 | cores 6255 | . . 3 ⊢ (ran 𝐹 ⊆ 𝐵 → (( I ↾ 𝐵) ∘ 𝐹) = ( I ∘ 𝐹)) | |
| 3 | fnrel 6644 | . . . 4 ⊢ (𝐹 Fn 𝐴 → Rel 𝐹) | |
| 4 | coi2 6270 | . . . 4 ⊢ (Rel 𝐹 → ( I ∘ 𝐹) = 𝐹) | |
| 5 | 3, 4 | syl 18 | . . 3 ⊢ (𝐹 Fn 𝐴 → ( I ∘ 𝐹) = 𝐹) |
| 6 | 2, 5 | sylan9eqr 2823 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵) → (( I ↾ 𝐵) ∘ 𝐹) = 𝐹) |
| 7 | 1, 6 | sylbi 220 | 1 ⊢ (𝐹:𝐴⟶𝐵 → (( I ↾ 𝐵) ∘ 𝐹) = 𝐹) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ∧ wa 401 = wceq 1570 ⊆ wss 3908 I cid 5560 ran crn 5667 ↾ cres 5668 ∘ ccom 5670 Rel wrel 5671 Fn wfn 6538 ⟶wf 6539 |
| 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 2738 ax-sep 5262 ax-pr 5409 |
| 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 2745 df-cleq 2758 df-clel 2841 df-ral 3083 df-rex 3093 df-rab 3420 df-v 3460 df-dif 3911 df-un 3913 df-in 3915 df-ss 3925 df-nul 4290 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-br 5115 df-opab 5179 df-id 5561 df-xp 5672 df-rel 5673 df-cnv 5674 df-co 5675 df-dm 5676 df-rn 5677 df-res 5678 df-fun 6545 df-fn 6546 df-f 6547 |
| This theorem is used by: fcof1oinvd 7302 mapen 9139 mapfien 9378 hashfacen 14511 cofulid 17972 setccatid 18166 estrccatid 18213 efmndid 18978 efmndmnd 18979 symggrp 19501 f1omvdco2 19549 symggen 19571 psgnunilem1 19594 gsumval3 20008 gsumzf1o 20013 frgpcyg 21760 f1linds 22012 qtophmeo 24011 motgrp 28849 hoico2 32146 fcoinver 32986 fcobij 33102 fcobijfs2 33104 symgfcoeu 33433 symgcom 33434 pmtrcnel2 33441 cycpmconjs 33507 subfacp1lem5 35697 ltrncoidN 40943 trlcoat 41538 trlcone 41543 cdlemg47a 41549 cdlemg47 41551 trljco 41555 tgrpgrplem 41564 tendo1mul 41585 tendo0pl 41606 cdlemkid2 41739 cdlemk45 41762 cdlemk53b 41771 erng1r 41810 tendocnv 41836 dvalveclem 41840 dva0g 41842 dvhgrp 41922 dvhlveclem 41923 dvh0g 41926 cdlemn8 42019 dihordlem7b 42030 dihopelvalcpre 42063 aks6d1c6lem5 42985 mendring 43956 rngccatidALTV 49078 ringccatidALTV 49112 |
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