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Theorem fores 6806
Description: Restriction of an onto function. (Contributed by NM, 4-Mar-1997.)
Assertion
Ref Expression
fores ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴))

Proof of Theorem fores
StepHypRef Expression
1 funres 6582 . . 3 (Fun 𝐹 → Fun (𝐹 ↾ 𝐴))
21anim1i 627 . 2 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹))
3 df-fn 6541 . . 3 ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴))
4 df-ima 5664 . . . . 5 (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴)
54eqcomi 2770 . . . 4 ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴)
6 df-fo 6544 . . . 4 ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴) Fn 𝐴 ∧ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴)))
75, 6mpbiran2 723 . . 3 ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (𝐹 ↾ 𝐴) Fn 𝐴)
8 ssdmres 6004 . . . 4 (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹 ↾ 𝐴) = 𝐴)
98anbi2i 635 . . 3 ((Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴))
103, 7, 93bitr4i 306 . 2 ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹))
112, 10sylibr 237 1 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   = wceq 1570   ⊆ wss 3899  dom cdm 5651  ran crn 5652   ↾ cres 5653   “ cima 5654  Fun wfun 6532   Fn wfn 6533  –onto→wfo 6536
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 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-pr 5391
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 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-res 5663  df-ima 5664  df-fun 6540  df-fn 6541  df-fo 6544
This theorem is used by:  fimadmfoALT  6807  resdif  6846  f1oweALT  7984  imafi  9307  f1opwfi  9345  fodomfi2  10139  fin1a2lem7  10484  znnen  16380  connima  23743  1stcfb  23763  1stckgenlem  23872  qtoprest  24036  re2ndc  25120  uniiccdif  25899  opnmblALT  25924  mbfimaopnlem  25976  ffsrn  33320  cycpmconjvlem  33702  erdszelem2  35957  ivthALT  37123  poimirlem26  38564  poimirlem27  38565  lmhmfgima  44085
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