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Theorem fores 5605
Description: Restriction of a function. (Contributed by NM, 4-Mar-1997.)
Assertion
Ref Expression
fores ((Fun 𝐹𝐴 ⊆ dom 𝐹) → (𝐹𝐴):𝐴onto→(𝐹𝐴))

Proof of Theorem fores
StepHypRef Expression
1 funres 5398 . . 3 (Fun 𝐹 → Fun (𝐹𝐴))
21anim1i 340 . 2 ((Fun 𝐹𝐴 ⊆ dom 𝐹) → (Fun (𝐹𝐴) ∧ 𝐴 ⊆ dom 𝐹))
3 df-fn 5360 . . 3 ((𝐹𝐴) Fn 𝐴 ↔ (Fun (𝐹𝐴) ∧ dom (𝐹𝐴) = 𝐴))
4 df-ima 4767 . . . . 5 (𝐹𝐴) = ran (𝐹𝐴)
54eqcomi 2238 . . . 4 ran (𝐹𝐴) = (𝐹𝐴)
6 df-fo 5363 . . . 4 ((𝐹𝐴):𝐴onto→(𝐹𝐴) ↔ ((𝐹𝐴) Fn 𝐴 ∧ ran (𝐹𝐴) = (𝐹𝐴)))
75, 6mpbiran2 950 . . 3 ((𝐹𝐴):𝐴onto→(𝐹𝐴) ↔ (𝐹𝐴) Fn 𝐴)
8 ssdmres 5065 . . . 4 (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹𝐴) = 𝐴)
98anbi2i 457 . . 3 ((Fun (𝐹𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹𝐴) ∧ dom (𝐹𝐴) = 𝐴))
103, 7, 93bitr4i 212 . 2 ((𝐹𝐴):𝐴onto→(𝐹𝐴) ↔ (Fun (𝐹𝐴) ∧ 𝐴 ⊆ dom 𝐹))
112, 10sylibr 134 1 ((Fun 𝐹𝐴 ⊆ dom 𝐹) → (𝐹𝐴):𝐴onto→(𝐹𝐴))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 104   = wceq 1398  wss 3214  dom cdm 4754  ran crn 4755  cres 4756  cima 4757  Fun wfun 5351   Fn wfn 5352  ontowfo 5355
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2208  ax-ext 2216  ax-sep 4233  ax-pow 4292  ax-pr 4327
This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-clab 2221  df-cleq 2227  df-clel 2230  df-nfc 2375  df-ral 2527  df-rex 2528  df-v 2817  df-un 3218  df-in 3220  df-ss 3227  df-pw 3676  df-sn 3700  df-pr 3701  df-op 3703  df-br 4115  df-opab 4177  df-xp 4760  df-rel 4761  df-cnv 4762  df-co 4763  df-dm 4764  df-res 4766  df-ima 4767  df-fun 5359  df-fn 5360  df-fo 5363
This theorem is referenced by:  resdif  5641  ctinf  13268  qnnen  13269
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