Theorem strnfvnd 13092

Description: Deduction version of strnfvn 13093. (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 2814	. 2 ⊢ (𝜑 → 𝑆 ∈ V)
3		strnfvnd.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ ℕ)
4		fvexg 5654	. . 3 ⊢ ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ) → (𝑆‘𝑁) ∈ V)
5	1, 3, 4	syl2anc 411	. 2 ⊢ (𝜑 → (𝑆‘𝑁) ∈ V)
6		fveq1 5634	. . 3 ⊢ (𝑥 = 𝑆 → (𝑥‘𝑁) = (𝑆‘𝑁))
7		strnfvnd.c	. . . 4 ⊢ 𝐸 = Slot 𝑁
8		df-slot 13076	. . . 4 ⊢ Slot 𝑁 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
9	7, 8	eqtri 2250	. . 3 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
10	6, 9	fvmptg 5718	. 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 1395   ∈ wcel 2200  Vcvv 2800   ↦ cmpt 4148  ‘cfv 5324  ℕcn 9133  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-sbc 3030  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-fv 5332  df-slot 13076

This theorem is referenced by:  strnfvn  13093  strfvssn  13094  strndxid  13100  strsetsid  13105  strslfvd  13114  strslfv2d  13115  setsslid  13123  setsslnid  13124  basm  13134  edgfndxid  15850