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Theorem slotslfn 12024
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 2692 . . 3 𝑥 ∈ V
2 slotslfn.e . . . 4 (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
32simpri 112 . . 3 (𝐸‘ndx) ∈ ℕ
41, 3fvex 5449 . 2 (𝑥‘(𝐸‘ndx)) ∈ V
52simpli 110 . . 3 𝐸 = Slot (𝐸‘ndx)
6 df-slot 12002 . . 3 Slot (𝐸‘ndx) = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
75, 6eqtri 2161 . 2 𝐸 = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
84, 7fnmpti 5259 1 𝐸 Fn V
Colors of variables: wff set class
Syntax hints:  wa 103   = wceq 1332  wcel 1481  Vcvv 2689  cmpt 3997   Fn wfn 5126  cfv 5131  cn 8744  ndxcnx 11995  Slot cslot 11997
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1424  ax-7 1425  ax-gen 1426  ax-ie1 1470  ax-ie2 1471  ax-8 1483  ax-10 1484  ax-11 1485  ax-i12 1486  ax-bndl 1487  ax-4 1488  ax-13 1492  ax-14 1493  ax-17 1507  ax-i9 1511  ax-ial 1515  ax-i5r 1516  ax-ext 2122  ax-sep 4054  ax-pow 4106  ax-pr 4139  ax-un 4363
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1335  df-nf 1438  df-sb 1737  df-eu 2003  df-mo 2004  df-clab 2127  df-cleq 2133  df-clel 2136  df-nfc 2271  df-ral 2422  df-rex 2423  df-v 2691  df-un 3080  df-in 3082  df-ss 3089  df-pw 3517  df-sn 3538  df-pr 3539  df-op 3541  df-uni 3745  df-br 3938  df-opab 3998  df-mpt 3999  df-id 4223  df-xp 4553  df-rel 4554  df-cnv 4555  df-co 4556  df-dm 4557  df-rn 4558  df-iota 5096  df-fun 5133  df-fn 5134  df-fv 5139  df-slot 12002
This theorem is referenced by:  slotex  12025  basfn  12055  topontopn  12243
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