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Theorem bj-evalf 37744
Description: The evaluation at a class is a function from the universal class into the universal class. (Contributed by BJ, 17-Mar-2026.)
Assertion
Ref Expression
bj-evalf Slot 𝐴:V⟶V

Proof of Theorem bj-evalf
Dummy variable 𝑓 is distinct from all other variables.
StepHypRef Expression
1 df-slot 17248 . 2 Slot 𝐴 = (𝑓 ∈ V ↦ (𝑓𝐴))
2 fvexd 6896 . 2 (𝑓 ∈ V → (𝑓𝐴) ∈ V)
31, 2fmpti 7107 1 Slot 𝐴:V⟶V
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  wcel 2142  Vcvv 3454  wf 6532  cfv 6536  Slot cslot 17247
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1824  ax-4 1838  ax-5 1939  ax-6 1996  ax-7 2037  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-sep 5256  ax-nul 5268  ax-pr 5403
This proof depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3an 1104  df-tru 1572  df-fal 1582  df-ex 1809  df-nf 1813  df-sb 2096  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-ral 3079  df-rex 3089  df-rab 3416  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4487  df-sn 4589  df-pr 4591  df-op 4595  df-uni 4872  df-br 5109  df-opab 5173  df-mpt 5192  df-id 5555  df-xp 5666  df-rel 5667  df-cnv 5668  df-co 5669  df-dm 5670  df-rn 5671  df-res 5672  df-ima 5673  df-iota 6492  df-fun 6538  df-fn 6539  df-f 6540  df-fv 6544  df-slot 17248
This theorem is used by: (None)
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