Theorem slotslfn 13098

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 2803	. . 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 5655	. 2 ⊢ (𝑥‘(𝐸‘ndx)) ∈ V
5	2	simpli 111	. . 3 ⊢ 𝐸 = Slot (𝐸‘ndx)
6		df-slot 13076	. . 3 ⊢ Slot (𝐸‘ndx) = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
7	5, 6	eqtri 2250	. 2 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
8	4, 7	fnmpti 5458	1 ⊢ 𝐸 Fn V

Syntax hints:   ∧ wa 104   = wceq 1395   ∈ wcel 2200  Vcvv 2800   ↦ cmpt 4148   Fn wfn 5319  ‘cfv 5324  ℕcn 9133  ndxcnx 13069  Slot cslot 13071

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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-13 2202  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297  ax-un 4528

This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-uni 3892  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-iota 5284  df-fun 5326  df-fn 5327  df-fv 5332  df-slot 13076

This theorem is referenced by:  slotex  13099  basfn  13131  topontopn  14751