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Theorem feqresmptf 42333
Description: Express a restricted function as a mapping. (Contributed by Glauco Siliprandi, 23-Oct-2021.)
Hypotheses
Ref Expression
feqresmptf.1 𝑥𝐹
feqresmptf.2 (𝜑𝐹:𝐴𝐵)
feqresmptf.3 (𝜑𝐶𝐴)
Assertion
Ref Expression
feqresmptf (𝜑 → (𝐹𝐶) = (𝑥𝐶 ↦ (𝐹𝑥)))
Distinct variable group:   𝑥,𝐶
Allowed substitution hints:   𝜑(𝑥)   𝐴(𝑥)   𝐵(𝑥)   𝐹(𝑥)

Proof of Theorem feqresmptf
StepHypRef Expression
1 nfcv 2900 . . 3 𝑥𝐶
2 feqresmptf.1 . . . 4 𝑥𝐹
32, 1nfres 5828 . . 3 𝑥(𝐹𝐶)
4 feqresmptf.2 . . . 4 (𝜑𝐹:𝐴𝐵)
5 feqresmptf.3 . . . 4 (𝜑𝐶𝐴)
64, 5fssresd 6546 . . 3 (𝜑 → (𝐹𝐶):𝐶𝐵)
71, 3, 6feqmptdf 6742 . 2 (𝜑 → (𝐹𝐶) = (𝑥𝐶 ↦ ((𝐹𝐶)‘𝑥)))
8 fvres 6696 . . 3 (𝑥𝐶 → ((𝐹𝐶)‘𝑥) = (𝐹𝑥))
98mpteq2ia 5122 . 2 (𝑥𝐶 ↦ ((𝐹𝐶)‘𝑥)) = (𝑥𝐶 ↦ (𝐹𝑥))
107, 9eqtrdi 2790 1 (𝜑 → (𝐹𝐶) = (𝑥𝐶 ↦ (𝐹𝑥)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1542  wnfc 2880  wss 3844  cmpt 5111  cres 5528  wf 6336  cfv 6340
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2711  ax-sep 5168  ax-nul 5175  ax-pr 5297
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2541  df-eu 2571  df-clab 2718  df-cleq 2731  df-clel 2812  df-nfc 2882  df-ral 3059  df-rex 3060  df-rab 3063  df-v 3401  df-sbc 3682  df-dif 3847  df-un 3849  df-in 3851  df-ss 3861  df-nul 4213  df-if 4416  df-sn 4518  df-pr 4520  df-op 4524  df-uni 4798  df-br 5032  df-opab 5094  df-mpt 5112  df-id 5430  df-xp 5532  df-rel 5533  df-cnv 5534  df-co 5535  df-dm 5536  df-rn 5537  df-res 5538  df-iota 6298  df-fun 6342  df-fn 6343  df-f 6344  df-fv 6348
This theorem is referenced by: (None)
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