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Theorem fores 6817
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 6591 . . 3 (Fun 𝐹 → Fun (𝐹 ↾ 𝐴))
21anim1i 627 . 2 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹))
3 df-fn 6550 . . 3 ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴))
4 df-ima 5668 . . . . 5 (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴)
54eqcomi 2772 . . . 4 ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴)
6 df-fo 6553 . . . 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 6010 . . . 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 1569   ⊆ wss 3900  dom cdm 5655  ran crn 5656   ↾ cres 5657   “ cima 5658  Fun wfun 6541   Fn wfn 6542  –onto→wfo 6545
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-ext 2735  ax-sep 5252  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2101  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-res 5667  df-ima 5668  df-fun 6549  df-fn 6550  df-fo 6553
This theorem is used by:  fimadmfoALT  6818  resdif  6857  f1oweALT  7994  imafi  9321  f1opwfi  9359  fodomfi2  10152  fin1a2lem7  10497  znnen  16395  connima  23758  1stcfb  23778  1stckgenlem  23887  qtoprest  24051  re2ndc  25135  uniiccdif  25914  opnmblALT  25939  mbfimaopnlem  25991  ffsrn  33376  cycpmconjvlem  33758  erdszelem2  36081  ivthALT  37253  poimirlem26  38707  poimirlem27  38708  lmhmfgima  44229
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