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Theorem bj-evalf 38070
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 17361 . 2 Slot 𝐴 = (𝑓 ∈ V ↦ (𝑓‘𝐴))
2 fvexd 6900 . 2 (𝑓 ∈ V → (𝑓‘𝐴) ∈ V)
31, 2fmpti 7112 1 Slot 𝐴:V⟶V
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   ∈ wcel 2144  Vcvv 3450  ⟶wf 6534  ‘cfv 6538  Slot cslot 17360
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4584  df-pr 4586  df-op 4590  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-ima 5663  df-iota 6494  df-fun 6540  df-fn 6541  df-f 6542  df-fv 6546  df-slot 17361
This theorem is used by: (None)
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