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Theorem slotslfn 12704
Description: A slot is a function on sets, treated as structures. (Contributed by Mario Carneiro, 22-Sep-2015.) (Revised by Jim Kingdon, 10-Feb-2023.)
Hypothesis
Ref Expression
slotslfn.e (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
Assertion
Ref Expression
slotslfn 𝐸 Fn V

Proof of Theorem slotslfn
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 vex 2766 . . 3 𝑥 ∈ V
2 slotslfn.e . . . 4 (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
32simpri 113 . . 3 (𝐸‘ndx) ∈ ℕ
41, 3fvex 5578 . 2 (𝑥‘(𝐸‘ndx)) ∈ V
52simpli 111 . . 3 𝐸 = Slot (𝐸‘ndx)
6 df-slot 12682 . . 3 Slot (𝐸‘ndx) = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
75, 6eqtri 2217 . 2 𝐸 = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
84, 7fnmpti 5386 1 𝐸 Fn V
Colors of variables: wff set class
Syntax hints:  wa 104   = wceq 1364  wcel 2167  Vcvv 2763  cmpt 4094   Fn wfn 5253  cfv 5258  cn 8990  ndxcnx 12675  Slot cslot 12677
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 710  ax-5 1461  ax-7 1462  ax-gen 1463  ax-ie1 1507  ax-ie2 1508  ax-8 1518  ax-10 1519  ax-11 1520  ax-i12 1521  ax-bndl 1523  ax-4 1524  ax-17 1540  ax-i9 1544  ax-ial 1548  ax-i5r 1549  ax-13 2169  ax-14 2170  ax-ext 2178  ax-sep 4151  ax-pow 4207  ax-pr 4242  ax-un 4468
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1475  df-sb 1777  df-eu 2048  df-mo 2049  df-clab 2183  df-cleq 2189  df-clel 2192  df-nfc 2328  df-ral 2480  df-rex 2481  df-v 2765  df-un 3161  df-in 3163  df-ss 3170  df-pw 3607  df-sn 3628  df-pr 3629  df-op 3631  df-uni 3840  df-br 4034  df-opab 4095  df-mpt 4096  df-id 4328  df-xp 4669  df-rel 4670  df-cnv 4671  df-co 4672  df-dm 4673  df-rn 4674  df-iota 5219  df-fun 5260  df-fn 5261  df-fv 5266  df-slot 12682
This theorem is referenced by:  slotex  12705  basfn  12736  topontopn  14273
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