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Theorem feqresmptf 46337
Description: Express a restricted function as a mapping. (Contributed by Glauco Siliprandi, 23-Oct-2021.)
Hypotheses
Ref Expression
feqresmptf.1 Ⅎ𝑥𝐹
feqresmptf.2 (𝜑 → 𝐹:𝐴⟶𝐵)
feqresmptf.3 (𝜑 → 𝐶 ⊆ 𝐴)
Assertion
Ref Expression
feqresmptf (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥)))
Distinct variable group:   𝑥,𝐶
Allowed substitution hints:   𝜑(𝑥)   𝐴(𝑥)   𝐵(𝑥)   𝐹(𝑥)

Proof of Theorem feqresmptf
StepHypRef Expression
1 nfcv 2922 . . 3 Ⅎ𝑥𝐶
2 feqresmptf.1 . . . 4 Ⅎ𝑥𝐹
32, 1nfres 5971 . . 3 Ⅎ𝑥(𝐹 ↾ 𝐶)
4 feqresmptf.2 . . . 4 (𝜑 → 𝐹:𝐴⟶𝐵)
5 feqresmptf.3 . . . 4 (𝜑 → 𝐶 ⊆ 𝐴)
64, 5fssresd 6750 . . 3 (𝜑 → (𝐹 ↾ 𝐶):𝐶⟶𝐵)
71, 3, 6feqmptdf 6956 . 2 (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥)))
8 fvres 6905 . . 3 (𝑥 ∈ 𝐶 → ((𝐹 ↾ 𝐶)‘𝑥) = (𝐹‘𝑥))
98mpteq2ia 5199 . 2 (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥)) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥))
107, 9eqtrdi 2811 1 (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1569  Ⅎwnfc 2907   ⊆ wss 3895   ↦ cmpt 5185   ↾ cres 5652  ⟶wf 6535  ‘cfv 6539
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1942  ax-6 1999  ax-7 2040  ax-8 2146  ax-9 2154  ax-10 2177  ax-11 2193  ax-12 2212  ax-ext 2732  ax-sep 5248  ax-nul 5259  ax-pr 5390
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2099  df-mo 2564  df-eu 2594  df-clab 2739  df-cleq 2752  df-clel 2835  df-nfc 2909  df-ne 2956  df-ral 3077  df-rex 3087  df-rab 3413  df-v 3452  df-ss 3896  df-dif 4047  df-in 4091  df-un 4151  df-nul 4279  df-if 4482  df-sn 4585  df-pr 4587  df-op 4835  df-uni 4867  df-br 5103  df-opab 5167  df-mpt 5186  df-id 5545  df-xp 5656  df-rel 5657  df-cnv 5658  df-co 5659  df-dm 5660  df-rn 5661  df-res 5662  df-iota 6494  df-fun 6541  df-fn 6542  df-f 6543  df-fv 6547
This theorem is used by: (None)
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