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Theorem funfvima2 7268
Description: A function's value in an included preimage belongs to the image. (Contributed by NM, 3-Feb-1997.)
Assertion
Ref Expression
funfvima2 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))

Proof of Theorem funfvima2
StepHypRef Expression
1 funfvima 7267 . . . . 5 ((Fun 𝐹 ∧ 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))
21ex 418 . . . 4 (Fun 𝐹 → (𝐵 ∈ dom 𝐹 → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))))
32com23 87 . . 3 (Fun 𝐹 → (𝐵 ∈ 𝐴 → (𝐵 ∈ dom 𝐹 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))))
43a2d 30 . 2 (Fun 𝐹 → ((𝐵 ∈ 𝐴 → 𝐵 ∈ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴))))
5 ssel 3907 . 2 (𝐴 ⊆ dom 𝐹 → (𝐵 ∈ 𝐴 → 𝐵 ∈ dom 𝐹))
64, 5impel 515 1 ((Fun 𝐹 ∧ 𝐴 ⊆ dom 𝐹) → (𝐵 ∈ 𝐴 → (𝐹‘𝐵) ∈ (𝐹 “ 𝐴)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2147   ⊆ wss 3900  dom cdm 5658   “ cima 5661  Fun wfun 6560  ‘cfv 6566
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 1945  ax-6 2002  ax-7 2043  ax-8 2149  ax-9 2157  ax-10 2180  ax-12 2216  ax-ext 2735  ax-sep 5255  ax-nul 5266  ax-pr 5398
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-nf 1817  df-sb 2102  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2839  df-ne 2960  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 4841  df-uni 4873  df-br 5109  df-opab 5174  df-id 5553  df-xp 5664  df-rel 5665  df-cnv 5666  df-co 5667  df-dm 5668  df-rn 5669  df-res 5670  df-ima 5671  df-iota 6520  df-fun 6568  df-fn 6569  df-fv 6574
This theorem is used by:  funfvima2d  7269  fnfvima  7270  resfvresima  7272  f1oweALT  8018  tz7.49  8493  phimullem  17000  mrcuni  17845  frlmsslsp  22157  lindfrn  22182  iscldtop  23468  1stcfb  23818  2ndcomap  23832  rnelfm  24327  fmfnfmlem2  24329  fmfnfmlem4  24331  qtopbaslem  25132  tgqioo  25174  bndth  25334  volsup  25932  dyadmbllem  25975  opnmbllem  25977  itg1addlem4  26075  c1liplem1  26371  dvcnvrelem1  26392  dvcnvrelem2  26393  plyco0  26565  plyaddlem1  26587  plymullem1  26588  dvloglem  27033  logf1o2  27035  efopn  27043  nobdaymin  28196  nocvxminlem  28197  axcontlem10  29608  imaelshi  32717  funimass4f  33329  sitgclg  35085  cvmliftlem3  36260  ivthALT  37338  opnmbllem0  38842  ismtyres  39008  heibor1lem  39009  ismrc  43978  aomclem4  44325
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