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Theorem fafvelcdm 45868
Description: A function's value belongs to its codomain, analogous to ffvelcdm 7083. (Contributed by Alexander van der Vekens, 25-May-2017.)
Assertion
Ref Expression
fafvelcdm ((𝐹:𝐴𝐵𝐶𝐴) → (𝐹'''𝐶) ∈ 𝐵)

Proof of Theorem fafvelcdm
StepHypRef Expression
1 ffn 6717 . . 3 (𝐹:𝐴𝐵𝐹 Fn 𝐴)
2 fnafvelrn 45867 . . 3 ((𝐹 Fn 𝐴𝐶𝐴) → (𝐹'''𝐶) ∈ ran 𝐹)
31, 2sylan 580 . 2 ((𝐹:𝐴𝐵𝐶𝐴) → (𝐹'''𝐶) ∈ ran 𝐹)
4 frn 6724 . . . 4 (𝐹:𝐴𝐵 → ran 𝐹𝐵)
54sseld 3981 . . 3 (𝐹:𝐴𝐵 → ((𝐹'''𝐶) ∈ ran 𝐹 → (𝐹'''𝐶) ∈ 𝐵))
65adantr 481 . 2 ((𝐹:𝐴𝐵𝐶𝐴) → ((𝐹'''𝐶) ∈ ran 𝐹 → (𝐹'''𝐶) ∈ 𝐵))
73, 6mpd 15 1 ((𝐹:𝐴𝐵𝐶𝐴) → (𝐹'''𝐶) ∈ 𝐵)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396  wcel 2106  ran crn 5677   Fn wfn 6538  wf 6539  '''cafv 45815
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 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2703  ax-sep 5299  ax-nul 5306  ax-pr 5427
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2534  df-eu 2563  df-clab 2710  df-cleq 2724  df-clel 2810  df-nfc 2885  df-ne 2941  df-ral 3062  df-rex 3071  df-rab 3433  df-v 3476  df-sbc 3778  df-csb 3894  df-dif 3951  df-un 3953  df-in 3955  df-ss 3965  df-nul 4323  df-if 4529  df-sn 4629  df-pr 4631  df-op 4635  df-uni 4909  df-int 4951  df-br 5149  df-opab 5211  df-id 5574  df-xp 5682  df-rel 5683  df-cnv 5684  df-co 5685  df-dm 5686  df-rn 5687  df-res 5688  df-iota 6495  df-fun 6545  df-fn 6546  df-f 6547  df-fv 6551  df-aiota 45783  df-dfat 45817  df-afv 45818
This theorem is referenced by:  ffnafv  45869
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