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Theorem funfvima2 7235
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 7234 . . . . 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 3925 . 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 2145   ⊆ wss 3899  dom cdm 5651   “ cima 5654  Fun wfun 6531  ‘cfv 6537
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-10 2178  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-nul 5260  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-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-ne 2957  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-uni 4868  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-iota 6493  df-fun 6539  df-fn 6540  df-fv 6545
This theorem is used by:  funfvima2d  7236  fnfvima  7237  resfvresima  7239  f1oweALT  7982  tz7.49  8448  phimullem  16949  mrcuni  17788  frlmsslsp  22095  lindfrn  22120  iscldtop  23406  1stcfb  23756  2ndcomap  23770  rnelfm  24265  fmfnfmlem2  24267  fmfnfmlem4  24269  qtopbaslem  25070  tgqioo  25112  bndth  25272  volsup  25870  dyadmbllem  25913  opnmbllem  25915  itg1addlem4  26013  c1liplem1  26309  dvcnvrelem1  26330  dvcnvrelem2  26331  plyco0  26503  plyaddlem1  26525  plymullem1  26526  dvloglem  26969  logf1o2  26971  efopn  26979  nobdaymin  28132  nocvxminlem  28133  axcontlem10  29544  imaelshi  32653  funimass4f  33224  sitgclg  34967  cvmliftlem3  36031  ivthALT  37103  opnmbllem0  38554  ismtyres  38722  heibor1lem  38723  ismrc  43691  aomclem4  44043
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