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Theorem fv2prc 6876
Description: A function value of a function value at a proper class is the empty set. (Contributed by AV, 8-Apr-2021.)
Assertion
Ref Expression
fv2prc 𝐴 ∈ V → ((𝐹𝐴)‘𝐵) = ∅)

Proof of Theorem fv2prc
StepHypRef Expression
1 fvprc 6826 . . 3 𝐴 ∈ V → (𝐹𝐴) = ∅)
21fveq1d 6836 . 2 𝐴 ∈ V → ((𝐹𝐴)‘𝐵) = (∅‘𝐵))
3 0fv 6875 . 2 (∅‘𝐵) = ∅
42, 3eqtrdi 2791 1 𝐴 ∈ V → ((𝐹𝐴)‘𝐵) = ∅)
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4   = wceq 1547  wcel 2119  Vcvv 3432  c0 4268  cfv 6492
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2712  ax-nul 5235  ax-pr 5369
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-mo 2543  df-eu 2573  df-clab 2719  df-cleq 2732  df-clel 2815  df-ne 2936  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-op 4569  df-uni 4846  df-br 5080  df-dm 5635  df-iota 6448  df-fv 6500
This theorem is referenced by:  elfv2ex  6877  itunitc1  10340  indval0  12161  sralem  21173  srasca  21177  sravsca  21178  sraip  21179
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