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Theorem fafvelcdm 47935
Description: A function's value belongs to its codomain, analogous to ffvelcdm 7076. (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 6705 . . 3 (𝐹:𝐴𝐵𝐹 Fn 𝐴)
2 fnafvelrn 47934 . . 3 ((𝐹 Fn 𝐴𝐶𝐴) → (𝐹'''𝐶) ∈ ran 𝐹)
31, 2sylan 591 . 2 ((𝐹:𝐴𝐵𝐶𝐴) → (𝐹'''𝐶) ∈ ran 𝐹)
4 frn 6713 . . . 4 (𝐹:𝐴𝐵 → ran 𝐹𝐵)
54sseld 3936 . . 3 (𝐹:𝐴𝐵 → ((𝐹'''𝐶) ∈ ran 𝐹 → (𝐹'''𝐶) ∈ 𝐵))
65adantr 485 . 2 ((𝐹:𝐴𝐵𝐶𝐴) → ((𝐹'''𝐶) ∈ ran 𝐹 → (𝐹'''𝐶) ∈ 𝐵))
73, 6mpd 16 1 ((𝐹:𝐴𝐵𝐶𝐴) → (𝐹'''𝐶) ∈ 𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wi 4  wa 400  wcel 2143  ran crn 5662   Fn wfn 6531  wf 6532  '''cafv 47882
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1825  ax-4 1839  ax-5 1940  ax-6 1997  ax-7 2038  ax-8 2145  ax-9 2153  ax-10 2176  ax-11 2192  ax-12 2213  ax-ext 2735  ax-sep 5257  ax-nul 5269  ax-pr 5404
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1810  df-nf 1814  df-sb 2097  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ne 2959  df-ral 3080  df-rex 3090  df-rab 3417  df-v 3457  df-sbc 3745  df-csb 3854  df-dif 3908  df-un 3910  df-in 3912  df-ss 3922  df-nul 4287  df-if 4488  df-sn 4590  df-pr 4592  df-op 4596  df-uni 4873  df-int 4913  df-br 5110  df-opab 5174  df-id 5556  df-xp 5667  df-rel 5668  df-cnv 5669  df-co 5670  df-dm 5671  df-rn 5672  df-res 5673  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-fv 6544  df-aiota 47850  df-dfat 47884  df-afv 47885
This theorem is used by:  ffnafv  47936
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