Theorem slotslfn 13238

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 2816	. . 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 5690	. 2 ⊢ (𝑥‘(𝐸‘ndx)) ∈ V
5	2	simpli 111	. . 3 ⊢ 𝐸 = Slot (𝐸‘ndx)
6		df-slot 13216	. . 3 ⊢ Slot (𝐸‘ndx) = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
7	5, 6	eqtri 2253	. 2 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘(𝐸‘ndx)))
8	4, 7	fnmpti 5487	1 ⊢ 𝐸 Fn V

Syntax hints:   ∧ wa 104   = wceq 1398   ∈ wcel 2203  Vcvv 2813   ↦ cmpt 4171   Fn wfn 5347  ‘cfv 5352  ℕcn 9237  ndxcnx 13209  Slot cslot 13211

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 2205  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322  ax-un 4554

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-uni 3915  df-br 4110  df-opab 4172  df-mpt 4173  df-id 4414  df-xp 4755  df-rel 4756  df-cnv 4757  df-co 4758  df-dm 4759  df-rn 4760  df-iota 5312  df-fun 5354  df-fn 5355  df-fv 5360  df-slot 13216

This theorem is referenced by:  slotex  13239  basfn  13271  topontopn  14902