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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 6496 | . 2 ⊢ (𝐹:𝐴⟶𝐵 ↔ (𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵)) | |
| 2 | cores 6207 | . . 3 ⊢ (ran 𝐹 ⊆ 𝐵 → (( I ↾ 𝐵) ∘ 𝐹) = ( I ∘ 𝐹)) | |
| 3 | fnrel 6594 | . . . 4 ⊢ (𝐹 Fn 𝐴 → Rel 𝐹) | |
| 4 | coi2 6222 | . . . 4 ⊢ (Rel 𝐹 → ( I ∘ 𝐹) = 𝐹) | |
| 5 | 3, 4 | syl 17 | . . 3 ⊢ (𝐹 Fn 𝐴 → ( I ∘ 𝐹) = 𝐹) |
| 6 | 2, 5 | sylan9eqr 2793 | . 2 ⊢ ((𝐹 Fn 𝐴 ∧ ran 𝐹 ⊆ 𝐵) → (( I ↾ 𝐵) ∘ 𝐹) = 𝐹) |
| 7 | 1, 6 | sylbi 217 | 1 ⊢ (𝐹:𝐴⟶𝐵 → (( I ↾ 𝐵) ∘ 𝐹) = 𝐹) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1541 ⊆ wss 3901 I cid 5518 ran crn 5625 ↾ cres 5626 ∘ ccom 5628 Rel wrel 5629 Fn wfn 6487 ⟶wf 6488 |
| 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 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-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-fun 6494 df-fn 6495 df-f 6496 |
| This theorem is referenced by: fcof1oinvd 7239 mapen 9069 mapfien 9311 hashfacen 14377 cofulid 17814 setccatid 18008 estrccatid 18055 efmndid 18813 efmndmnd 18814 symggrp 19329 f1omvdco2 19377 symggen 19399 psgnunilem1 19422 gsumval3 19836 gsumzf1o 19841 frgpcyg 21528 f1linds 21780 qtophmeo 23761 motgrp 28615 hoico2 31832 fcoinver 32679 fcobij 32799 fcobijfs2 32801 symgfcoeu 33164 symgcom 33165 pmtrcnel2 33172 cycpmconjs 33238 subfacp1lem5 35378 ltrncoidN 40388 trlcoat 40983 trlcone 40988 cdlemg47a 40994 cdlemg47 40996 trljco 41000 tgrpgrplem 41009 tendo1mul 41030 tendo0pl 41051 cdlemkid2 41184 cdlemk45 41207 cdlemk53b 41216 erng1r 41255 tendocnv 41281 dvalveclem 41285 dva0g 41287 dvhgrp 41367 dvhlveclem 41368 dvh0g 41371 cdlemn8 41464 dihordlem7b 41475 dihopelvalcpre 41508 aks6d1c6lem5 42431 mendring 43430 rngccatidALTV 48518 ringccatidALTV 48552 |
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