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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 6527 | . . 3 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴)) | |
| 2 | 1 | anim1i 621 | . 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 3 | df-fn 6488 | . . 3 ⊢ ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) | |
| 4 | df-ima 5631 | . . . . 5 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴) | |
| 5 | 4 | eqcomi 2748 | . . . 4 ⊢ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴) |
| 6 | df-fo 6491 | . . . 4 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴) Fn 𝐴 ∧ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴))) | |
| 7 | 5, 6 | mpbiran2 716 | . . 3 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (𝐹 ↾ 𝐴) Fn 𝐴) |
| 8 | ssdmres 5965 | . . . 4 ⊢ (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹 ↾ 𝐴) = 𝐴) | |
| 9 | 8 | anbi2i 629 | . . 3 ⊢ ((Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴)) |
| 10 | 3, 7, 9 | 3bitr4i 304 | . 2 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹)) |
| 11 | 2, 10 | sylibr 235 | 1 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ⊆ wss 3883 dom cdm 5618 ran crn 5619 ↾ cres 5620 “ cima 5621 Fun wfun 6479 Fn wfn 6480 –onto→wfo 6483 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2711 ax-sep 5218 ax-pr 5362 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-sb 2074 df-clab 2718 df-cleq 2731 df-clel 2814 df-ral 3054 df-rex 3064 df-rab 3392 df-v 3433 df-dif 3886 df-un 3888 df-in 3890 df-ss 3900 df-nul 4262 df-if 4455 df-sn 4556 df-pr 4558 df-op 4562 df-br 5073 df-opab 5135 df-xp 5624 df-rel 5625 df-cnv 5626 df-co 5627 df-dm 5628 df-res 5630 df-ima 5631 df-fun 6487 df-fn 6488 df-fo 6491 |
| This theorem is referenced by: fimadmfoALT 6750 resdif 6788 f1oweALT 7914 imafi 9215 f1opwfi 9256 fodomfi2 9973 fin1a2lem7 10319 znnen 16170 connima 23408 1stcfb 23428 1stckgenlem 23536 qtoprest 23700 re2ndc 24784 uniiccdif 25563 opnmblALT 25588 mbfimaopnlem 25640 ffsrn 32820 cycpmconjvlem 33222 erdszelem2 35420 ivthALT 36563 poimirlem26 38013 poimirlem27 38014 lmhmfgima 43529 |
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