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Theorem fvtresfn 6988
Description: Functionality of a tuple-restriction function. (Contributed by Stefan O'Rear, 24-Jan-2015.)
Hypothesis
Ref Expression
fvtresfn.f 𝐹 = (𝑥 ∈ 𝐵 ↦ (𝑥 ↾ 𝑉))
Assertion
Ref Expression
fvtresfn (𝑋 ∈ 𝐵 → (𝐹‘𝑋) = (𝑋 ↾ 𝑉))
Distinct variable groups:   𝑥,𝐵   𝑥,𝑉   𝑥,𝑋
Allowed substitution hint:   𝐹(𝑥)

Proof of Theorem fvtresfn
StepHypRef Expression
1 resexg 6018 . 2 (𝑋 ∈ 𝐵 → (𝑋 ↾ 𝑉) ∈ V)
2 reseq1 5964 . . 3 (𝑥 = 𝑋 → (𝑥 ↾ 𝑉) = (𝑋 ↾ 𝑉))
3 fvtresfn.f . . 3 𝐹 = (𝑥 ∈ 𝐵 ↦ (𝑥 ↾ 𝑉))
42, 3fvmptg 6983 . 2 ((𝑋 ∈ 𝐵 ∧ (𝑋 ↾ 𝑉) ∈ V) → (𝐹‘𝑋) = (𝑋 ↾ 𝑉))
51, 4mpdan 700 1 (𝑋 ∈ 𝐵 → (𝐹‘𝑋) = (𝑋 ↾ 𝑉))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570   ∈ wcel 2145  Vcvv 3451   ↦ cmpt 5186   ↾ cres 5653  ‘cfv 6531
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2213  ax-ext 2733  ax-sep 5249  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-nf 1817  df-sb 2100  df-mo 2565  df-eu 2595  df-clab 2740  df-cleq 2753  df-clel 2836  df-nfc 2910  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-uni 4868  df-br 5104  df-opab 5168  df-mpt 5187  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-res 5663  df-iota 6487  df-fun 6533  df-fv 6539
This theorem is used by:  symgfixf1  19631  symgfixfo  19633  pwssplit1  21314  pwssplit2  21315  pwssplit3  21316  eulerpartgbij  34987  pwssplit4  44049
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