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Theorem feqresmptf 44598
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 2899 . . 3 𝑥𝐶
2 feqresmptf.1 . . . 4 𝑥𝐹
32, 1nfres 5981 . . 3 𝑥(𝐹𝐶)
4 feqresmptf.2 . . . 4 (𝜑𝐹:𝐴𝐵)
5 feqresmptf.3 . . . 4 (𝜑𝐶𝐴)
64, 5fssresd 6758 . . 3 (𝜑 → (𝐹𝐶):𝐶𝐵)
71, 3, 6feqmptdf 6963 . 2 (𝜑 → (𝐹𝐶) = (𝑥𝐶 ↦ ((𝐹𝐶)‘𝑥)))
8 fvres 6910 . . 3 (𝑥𝐶 → ((𝐹𝐶)‘𝑥) = (𝐹𝑥))
98mpteq2ia 5245 . 2 (𝑥𝐶 ↦ ((𝐹𝐶)‘𝑥)) = (𝑥𝐶 ↦ (𝐹𝑥))
107, 9eqtrdi 2784 1 (𝜑 → (𝐹𝐶) = (𝑥𝐶 ↦ (𝐹𝑥)))
Colors of variables: wff setvar class
Syntax hints:  wi 4   = wceq 1534  wnfc 2879  wss 3945  cmpt 5225  cres 5674  wf 6538  cfv 6542
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1964  ax-7 2004  ax-8 2101  ax-9 2109  ax-10 2130  ax-11 2147  ax-12 2167  ax-ext 2699  ax-sep 5293  ax-nul 5300  ax-pr 5423
This theorem depends on definitions:  df-bi 206  df-an 396  df-or 847  df-3an 1087  df-tru 1537  df-fal 1547  df-ex 1775  df-nf 1779  df-sb 2061  df-mo 2530  df-eu 2559  df-clab 2706  df-cleq 2720  df-clel 2806  df-nfc 2881  df-ne 2937  df-ral 3058  df-rex 3067  df-rab 3429  df-v 3472  df-dif 3948  df-un 3950  df-in 3952  df-ss 3962  df-nul 4319  df-if 4525  df-sn 4625  df-pr 4627  df-op 4631  df-uni 4904  df-br 5143  df-opab 5205  df-mpt 5226  df-id 5570  df-xp 5678  df-rel 5679  df-cnv 5680  df-co 5681  df-dm 5682  df-rn 5683  df-res 5684  df-iota 6494  df-fun 6544  df-fn 6545  df-f 6546  df-fv 6550
This theorem is referenced by: (None)
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