Theorem strnfvnd 13350

Description: Deduction version of strnfvn 13351. (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 2835	. 2 ⊢ (𝜑 → 𝑆 ∈ V)
3		strnfvnd.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ ℕ)
4		fvexg 5709	. . 3 ⊢ ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ) → (𝑆‘𝑁) ∈ V)
5	1, 3, 4	syl2anc 415	. 2 ⊢ (𝜑 → (𝑆‘𝑁) ∈ V)
6		fveq1 5689	. . 3 ⊢ (𝑥 = 𝑆 → (𝑥‘𝑁) = (𝑆‘𝑁))
7		strnfvnd.c	. . . 4 ⊢ 𝐸 = Slot 𝑁
8		df-slot 13334	. . . 4 ⊢ Slot 𝑁 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
9	7, 8	eqtri 2259	. . 3 ⊢ 𝐸 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
10	6, 9	fvmptg 5775	. 2 ⊢ ((𝑆 ∈ V ∧ (𝑆‘𝑁) ∈ V) → (𝐸‘𝑆) = (𝑆‘𝑁))
11	2, 5, 10	syl2anc 415	1 ⊢ (𝜑 → (𝐸‘𝑆) = (𝑆‘𝑁))

Syntax hints:   → wi 4   = wceq 1402   ∈ wcel 2209  Vcvv 2821   ↦ cmpt 4187  ‘cfv 5372  ℕcn 9283  Slot cslot 13329

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341  ax-un 4573

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-iota 5332  df-fun 5374  df-fv 5380  df-slot 13334

This theorem is referenced by:  strnfvn  13351  strfvssn  13352  strndxid  13358  strsetsid  13363  strslfvd  13372  strslfv2d  13373  setsslid  13381  setsslnid  13382  basm  13392  edgfndxid  16164