Theorem fores 6762

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

Step	Hyp	Ref	Expression
1		funres 6540	. . 3 ⊢ (Fun 𝐹 → Fun (𝐹 ↾ 𝐴))
2	1	anim1i 616	. 2 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹))
3		df-fn 6501	. . 3 ⊢ ((𝐹 ↾ 𝐴) Fn 𝐴 ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴))
4		df-ima 5644	. . . . 5 ⊢ (𝐹 “ 𝐴) = ran (𝐹 ↾ 𝐴)
5	4	eqcomi 2745	. . . 4 ⊢ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴)
6		df-fo 6504	. . . 4 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ ((𝐹 ↾ 𝐴) Fn 𝐴 ∧ ran (𝐹 ↾ 𝐴) = (𝐹 “ 𝐴)))
7	5, 6	mpbiran2 711	. . 3 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (𝐹 ↾ 𝐴) Fn 𝐴)
8		ssdmres 5978	. . . 4 ⊢ (𝐴 ⊆ dom 𝐹 ↔ dom (𝐹 ↾ 𝐴) = 𝐴)
9	8	anbi2i 624	. . 3 ⊢ ((Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹) ↔ (Fun (𝐹 ↾ 𝐴) ∧ dom (𝐹 ↾ 𝐴) = 𝐴))
10	3, 7, 9	3bitr4i 303	. 2 ⊢ ((𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴) ↔ (Fun (𝐹 ↾ 𝐴) ∧ 𝐴 ⊆ dom 𝐹))
11	2, 10	sylibr 234	1 ⊢ ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐹 ↾ 𝐴):𝐴–onto→(𝐹 “ 𝐴))

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1542   ⊆ wss 3889  dom cdm 5631  ran crn 5632   ↾ cres 5633   “ cima 5634  Fun wfun 6492   Fn wfn 6493  –onto→wfo 6496

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1912  ax-6 1969  ax-7 2010  ax-8 2116  ax-9 2124  ax-ext 2708  ax-sep 5231  ax-pr 5375

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-3an 1089  df-tru 1545  df-fal 1555  df-ex 1782  df-sb 2069  df-clab 2715  df-cleq 2728  df-clel 2811  df-ral 3052  df-rex 3062  df-rab 3390  df-v 3431  df-dif 3892  df-un 3894  df-in 3896  df-ss 3906  df-nul 4274  df-if 4467  df-sn 4568  df-pr 4570  df-op 4574  df-br 5086  df-opab 5148  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-res 5643  df-ima 5644  df-fun 6500  df-fn 6501  df-fo 6504

This theorem is referenced by:  fimadmfoALT  6763  resdif  6801  f1oweALT  7925  imafi  9225  f1opwfi  9266  fodomfi2  9982  fin1a2lem7  10328  znnen  16179  connima  23390  1stcfb  23410  1stckgenlem  23518  qtoprest  23682  re2ndc  24766  uniiccdif  25545  opnmblALT  25570  mbfimaopnlem  25622  ffsrn  32801  cycpmconjvlem  33202  erdszelem2  35374  ivthALT  36517  poimirlem26  37967  poimirlem27  37968  lmhmfgima  43512