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Theorem fafv2elcdm 48507
Description: An alternate function value belongs to the codomain of the function, analogous to ffvelcdm 7102. (Contributed by AV, 2-Sep-2022.)
Assertion
Ref Expression
fafv2elcdm ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹''''𝐶) ∈ 𝐵)

Proof of Theorem fafv2elcdm
StepHypRef Expression
1 ffn 6728 . . 3 (𝐹:𝐴⟶𝐵 → 𝐹 Fn 𝐴)
2 fnafv2elrn 48506 . . 3 ((𝐹 Fn 𝐴 ∧ 𝐶 ∈ 𝐴) → (𝐹''''𝐶) ∈ ran 𝐹)
31, 2sylan 592 . 2 ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹''''𝐶) ∈ ran 𝐹)
4 frn 6736 . . . 4 (𝐹:𝐴⟶𝐵 → ran 𝐹 ⊆ 𝐵)
54sseld 3912 . . 3 (𝐹:𝐴⟶𝐵 → ((𝐹''''𝐶) ∈ ran 𝐹 → (𝐹''''𝐶) ∈ 𝐵))
65adantr 486 . 2 ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → ((𝐹''''𝐶) ∈ ran 𝐹 → (𝐹''''𝐶) ∈ 𝐵))
73, 6mpd 16 1 ((𝐹:𝐴⟶𝐵 ∧ 𝐶 ∈ 𝐴) → (𝐹''''𝐶) ∈ 𝐵)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ∧ wa 401   ∈ wcel 2147  ran crn 5656   Fn wfn 6550  ⟶wf 6551  ''''cafv2 48481
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 5252  ax-nul 5263  ax-pr 5395
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-nel 3066  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-pw 4562  df-sn 4589  df-pr 4591  df-op 4839  df-uni 4871  df-br 5107  df-opab 5171  df-id 5550  df-xp 5661  df-rel 5662  df-cnv 5663  df-co 5664  df-dm 5665  df-rn 5666  df-res 5667  df-iota 6509  df-fun 6557  df-fn 6558  df-f 6559  df-dfat 48393  df-afv2 48482
This theorem is used by: (None)
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