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Theorem strnfvnd 13430
Description: Deduction version of strnfvn 13431. (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.
StepHypRef Expression
1 strnfvnd.f . . 3 (𝜑 → 𝑆 ∈ 𝑉)
21elexd 2835 . 2 (𝜑 → 𝑆 ∈ V)
3 strnfvnd.n . . 3 (𝜑 → 𝑁 ∈ ℕ)
4 fvexg 5717 . . 3 ((𝑆 ∈ 𝑉 ∧ 𝑁 ∈ ℕ) → (𝑆‘𝑁) ∈ V)
51, 3, 4syl2anc 415 . 2 (𝜑 → (𝑆‘𝑁) ∈ V)
6 fveq1 5697 . . 3 (𝑥 = 𝑆 → (𝑥‘𝑁) = (𝑆‘𝑁))
7 strnfvnd.c . . . 4 𝐸 = Slot 𝑁
8 df-slot 13414 . . . 4 Slot 𝑁 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
97, 8eqtri 2259 . . 3 𝐸 = (𝑥 ∈ V ↦ (𝑥‘𝑁))
106, 9fvmptg 5784 . 2 ((𝑆 ∈ V ∧ (𝑆‘𝑁) ∈ V) → (𝐸‘𝑆) = (𝑆‘𝑁))
112, 5, 10syl2anc 415 1 (𝜑 → (𝐸‘𝑆) = (𝑆‘𝑁))
Colors of variables:    wff set class
This proof depends on syntax axioms:   → wi 4   = wceq 1402   ∈ wcel 2209  Vcvv 2821   ↦ cmpt 4193  ‘cfv 5380  ℕcn 9313  Slot cslot 13409
This proof depends on 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 4251  ax-pow 4313  ax-pr 4348  ax-un 4580
This proof 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 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4132  df-opab 4194  df-mpt 4195  df-id 4440  df-xp 4782  df-rel 4783  df-cnv 4784  df-co 4785  df-dm 4786  df-rn 4787  df-iota 5340  df-fun 5382  df-fv 5388  df-slot 13414
This theorem is used by:  strnfvn  13431  strfvssn  13432  strndxid  13438  strsetsid  13443  strslfvd  13452  strslfv2d  13453  setsslid  13461  setsslnid  13462  basm  13472  slotm  13473  edgfndxid  16455
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