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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 6563 | . . 3 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴)) | |
| 2 | 1 | anim1i 624 | . 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 3 | df-fn 6524 | . . 3 ⊢ ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) | |
| 4 | df-ima 5660 | . . . . 5 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴) | |
| 5 | 4 | eqcomi 2771 | . . . 4 ⊢ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴) |
| 6 | df-fo 6527 | . . . 4 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴) Fn 𝐴 ∧ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴))) | |
| 7 | 5, 6 | mpbiran2 720 | . . 3 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (𝐹 ↾ 𝐴) Fn 𝐴) |
| 8 | ssdmres 5999 | . . . 4 ⊢ (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹 ↾ 𝐴) = 𝐴) | |
| 9 | 8 | anbi2i 632 | . . 3 ⊢ ((Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) |
| 10 | 3, 7, 9 | 3bitr4i 305 | . 2 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 11 | 2, 10 | sylibr 236 | 1 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 399 = wceq 1560 ⊆ wss 3904 dom cdm 5647 ran crn 5648 ↾ cres 5649 “ cima 5650 Fun wfun 6515 Fn wfn 6516 –onto→wfo 6519 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1815 ax-4 1829 ax-5 1930 ax-6 1987 ax-7 2028 ax-8 2144 ax-9 2152 ax-ext 2734 ax-sep 5246 ax-pr 5390 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1100 df-tru 1563 df-fal 1573 df-ex 1800 df-sb 2091 df-clab 2741 df-cleq 2754 df-clel 2837 df-ral 3077 df-rex 3087 df-rab 3415 df-v 3456 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-nul 4286 df-if 4481 df-sn 4583 df-pr 4585 df-op 4589 df-br 5101 df-opab 5163 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-res 5659 df-ima 5660 df-fun 6523 df-fn 6524 df-fo 6527 |
| This theorem is referenced by: fimadmfoALT 6789 resdif 6828 f1oweALT 7953 imafi 9259 f1opwfi 9299 fodomfi2 10016 fin1a2lem7 10363 znnen 16244 connima 23485 1stcfb 23505 1stckgenlem 23613 qtoprest 23777 re2ndc 24861 uniiccdif 25640 opnmblALT 25665 mbfimaopnlem 25717 ffsrn 32930 cycpmconjvlem 33321 erdszelem2 35542 ivthALT 36695 poimirlem26 38145 poimirlem27 38146 lmhmfgima 43661 |
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