Theorem strnfvnd 13101

Description: Deduction version of strnfvn 13102. (Contributed by Mario Carneiro, 15-Nov-2014.) (Revised by Jim Kingdon, 19-Jan-2023.)

Hypotheses

Ref	Expression
strnfvnd.c	⊢ 𝐸 = Slot 𝑁
strnfvnd.f	⊢ (𝜑 → 𝑆 ∈ 𝑉)
strnfvnd.n	⊢ (𝜑 → 𝑁 ∈ ℕ)

Assertion

Ref	Expression
strnfvnd	⊢ (𝜑 → (𝐸‘𝑆) = (𝑆‘𝑁))

Proof of Theorem strnfvnd

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		strnfvnd.f	. . 3 ⊢ (𝜑 → 𝑆 ∈ 𝑉)
2	1	elexd 2816	. 2 ⊢ (𝜑 → 𝑆 ∈ V)
3		strnfvnd.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ ℕ)
4		fvexg 5658	. . 3 ⊢ ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ) → (𝑆‘𝑁) ∈ V)
5	1, 3, 4	syl2anc 411	. 2 ⊢ (𝜑 → (𝑆‘𝑁) ∈ V)
6		fveq1 5638	. . 3 ⊢ (𝑥 = 𝑆 → (𝑥‘𝑁) = (𝑆‘𝑁))
7		strnfvnd.c	. . . 4 ⊢ 𝐸 = Slot 𝑁
8		df-slot 13085	. . . 4 ⊢ Slot 𝑁 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
9	7, 8	eqtri 2252	. . 3 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
10	6, 9	fvmptg 5722	. 2 ⊢ ((𝑆 ∈ V ∧ (𝑆‘𝑁) ∈ V) → (𝐸‘𝑆) = (𝑆‘𝑁))
11	2, 5, 10	syl2anc 411	1 ⊢ (𝜑 → (𝐸‘𝑆) = (𝑆‘𝑁))

Syntax hints:   → wi 4   = wceq 1397   ∈ wcel 2202  Vcvv 2802   ↦ cmpt 4150  ‘cfv 5326  ℕcn 9142  Slot cslot 13080

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-sbc 3032  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fv 5334  df-slot 13085

This theorem is referenced by:  strnfvn  13102  strfvssn  13103  strndxid  13109  strsetsid  13114  strslfvd  13123  strslfv2d  13124  setsslid  13132  setsslnid  13133  basm  13143  edgfndxid  15859