Theorem slotslfn 13188

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.

Step	Hyp	Ref	Expression
1		vex 2806	. . 3 ⊢ 𝑥 ∈ V
2		slotslfn.e	. . . 4 ⊢ (𝐸 = Slot (𝐸‘ndx) ∧ (𝐸‘ndx) ∈ ℕ)
3	2	simpri 113	. . 3 ⊢ (𝐸‘ndx) ∈ ℕ
4	1, 3	fvex 5668	. 2 ⊢ (𝑥‘(𝐸‘ndx)) ∈ V
5	2	simpli 111	. . 3 ⊢ 𝐸 = Slot (𝐸‘ndx)
6		df-slot 13166	. . 3 ⊢ Slot (𝐸‘ndx) = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
7	5, 6	eqtri 2252	. 2 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
8	4, 7	fnmpti 5468	1 ⊢ 𝐸 Fn V

Syntax hints:   ∧ wa 104   = wceq 1398   ∈ wcel 2202  Vcvv 2803   ↦ cmpt 4155   Fn wfn 5328  ‘cfv 5333  ℕcn 9202  ndxcnx 13159  Slot cslot 13161

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 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4212  ax-pow 4270  ax-pr 4305  ax-un 4536

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2364  df-ral 2516  df-rex 2517  df-v 2805  df-un 3205  df-in 3207  df-ss 3214  df-pw 3658  df-sn 3679  df-pr 3680  df-op 3682  df-uni 3899  df-br 4094  df-opab 4156  df-mpt 4157  df-id 4396  df-xp 4737  df-rel 4738  df-cnv 4739  df-co 4740  df-dm 4741  df-rn 4742  df-iota 5293  df-fun 5335  df-fn 5336  df-fv 5341  df-slot 13166

This theorem is referenced by:  slotex  13189  basfn  13221  topontopn  14848