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Theorem fvtresfn 6932
Description: Functionality of a tuple-restriction function. (Contributed by Stefan O'Rear, 24-Jan-2015.)
Hypothesis
Ref Expression
fvtresfn.f 𝐹 = (𝑥𝐵 ↦ (𝑥𝑉))
Assertion
Ref Expression
fvtresfn (𝑋𝐵 → (𝐹𝑋) = (𝑋𝑉))
Distinct variable groups:   𝑥,𝐵   𝑥,𝑉   𝑥,𝑋
Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem fvtresfn
StepHypRef Expression
1 resexg 5978 . 2 (𝑋𝐵 → (𝑋𝑉) ∈ V)
2 reseq1 5924 . . 3 (𝑥 = 𝑋 → (𝑥𝑉) = (𝑋𝑉))
3 fvtresfn.f . . 3 𝐹 = (𝑥𝐵 ↦ (𝑥𝑉))
42, 3fvmptg 6928 . 2 ((𝑋𝐵 ∧ (𝑋𝑉) ∈ V) → (𝐹𝑋) = (𝑋𝑉))
51, 4mpdan 687 1 (𝑋𝐵 → (𝐹𝑋) = (𝑋𝑉))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1540  wcel 2109  Vcvv 3436  cmpt 5173  cres 5621  cfv 6482
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-sep 5235  ax-nul 5245  ax-pr 5371
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ral 3045  df-rex 3054  df-rab 3395  df-v 3438  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-nul 4285  df-if 4477  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-br 5093  df-opab 5155  df-mpt 5174  df-id 5514  df-xp 5625  df-rel 5626  df-cnv 5627  df-co 5628  df-dm 5629  df-res 5631  df-iota 6438  df-fun 6484  df-fv 6490
This theorem is referenced by:  symgfixf1  19316  symgfixfo  19318  pwssplit1  20963  pwssplit2  20964  pwssplit3  20965  eulerpartgbij  34356  pwssplit4  43082
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