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Theorem strnfvnd 12447
Description: Deduction version of strnfvn 12448. (Contributed by Mario Carneiro, 15-Nov-2014.) (Revised by Jim Kingdon, 19-Jan-2023.)
Hypotheses
Ref Expression
strnfvnd.c 𝐸 = Slot 𝑁
strnfvnd.f (𝜑𝑆𝑉)
strnfvnd.n (𝜑𝑁 ∈ ℕ)
Assertion
Ref Expression
strnfvnd (𝜑 → (𝐸𝑆) = (𝑆𝑁))

Proof of Theorem strnfvnd
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 strnfvnd.f . . 3 (𝜑𝑆𝑉)
21elexd 2748 . 2 (𝜑𝑆 ∈ V)
3 strnfvnd.n . . 3 (𝜑𝑁 ∈ ℕ)
4 fvexg 5526 . . 3 ((𝑆𝑉𝑁 ∈ ℕ) → (𝑆𝑁) ∈ V)
51, 3, 4syl2anc 411 . 2 (𝜑 → (𝑆𝑁) ∈ V)
6 fveq1 5506 . . 3 (𝑥 = 𝑆 → (𝑥𝑁) = (𝑆𝑁))
7 strnfvnd.c . . . 4 𝐸 = Slot 𝑁
8 df-slot 12431 . . . 4 Slot 𝑁 = (𝑥 ∈ V ↦ (𝑥𝑁))
97, 8eqtri 2196 . . 3 𝐸 = (𝑥 ∈ V ↦ (𝑥𝑁))
106, 9fvmptg 5584 . 2 ((𝑆 ∈ V ∧ (𝑆𝑁) ∈ V) → (𝐸𝑆) = (𝑆𝑁))
112, 5, 10syl2anc 411 1 (𝜑 → (𝐸𝑆) = (𝑆𝑁))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1353  wcel 2146  Vcvv 2735  cmpt 4059  cfv 5208  cn 8890  Slot cslot 12426
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 709  ax-5 1445  ax-7 1446  ax-gen 1447  ax-ie1 1491  ax-ie2 1492  ax-8 1502  ax-10 1503  ax-11 1504  ax-i12 1505  ax-bndl 1507  ax-4 1508  ax-17 1524  ax-i9 1528  ax-ial 1532  ax-i5r 1533  ax-13 2148  ax-14 2149  ax-ext 2157  ax-sep 4116  ax-pow 4169  ax-pr 4203  ax-un 4427
This theorem depends on definitions:  df-bi 117  df-3an 980  df-tru 1356  df-nf 1459  df-sb 1761  df-eu 2027  df-mo 2028  df-clab 2162  df-cleq 2168  df-clel 2171  df-nfc 2306  df-ral 2458  df-rex 2459  df-v 2737  df-sbc 2961  df-un 3131  df-in 3133  df-ss 3140  df-pw 3574  df-sn 3595  df-pr 3596  df-op 3598  df-uni 3806  df-br 3999  df-opab 4060  df-mpt 4061  df-id 4287  df-xp 4626  df-rel 4627  df-cnv 4628  df-co 4629  df-dm 4630  df-rn 4631  df-iota 5170  df-fun 5210  df-fv 5216  df-slot 12431
This theorem is referenced by:  strnfvn  12448  strfvssn  12449  strndxid  12455  strsetsid  12460  strslfvd  12468  strslfv2d  12469  setsslid  12477  setsslnid  12478  ressid  12490
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