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Theorem feqresmptf 46212
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 2923 . . 3 Ⅎ𝑥𝐶
2 feqresmptf.1 . . . 4 Ⅎ𝑥𝐹
32, 1nfres 5972 . . 3 Ⅎ𝑥(𝐹 ↾ 𝐶)
4 feqresmptf.2 . . . 4 (𝜑 → 𝐹:𝐴⟶𝐵)
5 feqresmptf.3 . . . 4 (𝜑 → 𝐶 ⊆ 𝐴)
64, 5fssresd 6747 . . 3 (𝜑 → (𝐹 ↾ 𝐶):𝐶⟶𝐵)
71, 3, 6feqmptdf 6953 . 2 (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥)))
8 fvres 6902 . . 3 (𝑥 ∈ 𝐶 → ((𝐹 ↾ 𝐶)‘𝑥) = (𝐹‘𝑥))
98mpteq2ia 5200 . 2 (𝑥 ∈ 𝐶 ↦ ((𝐹 ↾ 𝐶)‘𝑥)) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥))
107, 9eqtrdi 2812 1 (𝜑 → (𝐹 ↾ 𝐶) = (𝑥 ∈ 𝐶 ↦ (𝐹‘𝑥)))
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   = wceq 1570  Ⅎwnfc 2908   ⊆ wss 3899   ↦ cmpt 5186   ↾ cres 5653  ⟶wf 6533  ‘cfv 6537
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-nul 5260  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-ne 2957  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-rn 5662  df-res 5663  df-iota 6493  df-fun 6539  df-fn 6540  df-f 6541  df-fv 6545
This theorem is used by: (None)
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