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| Mirrors > Home > MPE Home > Th. List > fores | Structured version Visualization version GIF version | ||
| Description: Restriction of an onto function. (Contributed by NM, 4-Mar-1997.) |
| Ref | Expression |
|---|---|
| fores | ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | funres 6535 | . . 3 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴)) | |
| 2 | 1 | anim1i 616 | . 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 3 | df-fn 6496 | . . 3 ⊢ ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) | |
| 4 | df-ima 5638 | . . . . 5 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴) | |
| 5 | 4 | eqcomi 2746 | . . . 4 ⊢ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴) |
| 6 | df-fo 6499 | . . . 4 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴) Fn 𝐴 ∧ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴))) | |
| 7 | 5, 6 | mpbiran2 711 | . . 3 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (𝐹 ↾ 𝐴) Fn 𝐴) |
| 8 | ssdmres 5973 | . . . 4 ⊢ (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹 ↾ 𝐴) = 𝐴) | |
| 9 | 8 | anbi2i 624 | . . 3 ⊢ ((Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) |
| 10 | 3, 7, 9 | 3bitr4i 303 | . 2 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 11 | 2, 10 | sylibr 234 | 1 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1542 ⊆ wss 3890 dom cdm 5625 ran crn 5626 ↾ cres 5627 “ cima 5628 Fun wfun 6487 Fn wfn 6488 –onto→wfo 6491 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5232 ax-pr 5371 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-br 5087 df-opab 5149 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-res 5637 df-ima 5638 df-fun 6495 df-fn 6496 df-fo 6499 |
| This theorem is referenced by: fimadmfoALT 6758 resdif 6796 f1oweALT 7919 imafi 9219 f1opwfi 9260 fodomfi2 9976 fin1a2lem7 10322 znnen 16173 connima 23403 1stcfb 23423 1stckgenlem 23531 qtoprest 23695 re2ndc 24779 uniiccdif 25558 opnmblALT 25583 mbfimaopnlem 25635 ffsrn 32819 cycpmconjvlem 33220 erdszelem2 35393 ivthALT 36536 poimirlem26 37984 poimirlem27 37985 lmhmfgima 43533 |
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