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Theorem fnmptd 13339
Description: The maps-to notation defines a function with domain (deduction form). (Contributed by BJ, 5-Aug-2024.)
Hypotheses
Ref Expression
fnmptd.def (𝜑𝐹 = (𝑥𝐴𝐵))
fnmptd.ex ((𝜑𝑥𝐴) → 𝐵𝑉)
Assertion
Ref Expression
fnmptd (𝜑𝐹 Fn 𝐴)
Distinct variable groups:   𝑥,𝐴   𝜑,𝑥
Allowed substitution hints:   𝐵(𝑥)   𝐹(𝑥)   𝑉(𝑥)

Proof of Theorem fnmptd
StepHypRef Expression
1 fnmptd.ex . . . 4 ((𝜑𝑥𝐴) → 𝐵𝑉)
21ralrimiva 2530 . . 3 (𝜑 → ∀𝑥𝐴 𝐵𝑉)
3 eqid 2157 . . . 4 (𝑥𝐴𝐵) = (𝑥𝐴𝐵)
43fnmpt 5293 . . 3 (∀𝑥𝐴 𝐵𝑉 → (𝑥𝐴𝐵) Fn 𝐴)
52, 4syl 14 . 2 (𝜑 → (𝑥𝐴𝐵) Fn 𝐴)
6 fnmptd.def . . 3 (𝜑𝐹 = (𝑥𝐴𝐵))
76fneq1d 5257 . 2 (𝜑 → (𝐹 Fn 𝐴 ↔ (𝑥𝐴𝐵) Fn 𝐴))
85, 7mpbird 166 1 (𝜑𝐹 Fn 𝐴)
Colors of variables: wff set class
Syntax hints:  wi 4  wa 103   = wceq 1335  wcel 2128  wral 2435  cmpt 4025   Fn wfn 5162
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-io 699  ax-5 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-14 2131  ax-ext 2139  ax-sep 4082  ax-pow 4134  ax-pr 4168
This theorem depends on definitions:  df-bi 116  df-3an 965  df-tru 1338  df-nf 1441  df-sb 1743  df-eu 2009  df-mo 2010  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-ral 2440  df-rex 2441  df-v 2714  df-un 3106  df-in 3108  df-ss 3115  df-pw 3545  df-sn 3566  df-pr 3567  df-op 3569  df-br 3966  df-opab 4026  df-mpt 4027  df-id 4252  df-xp 4589  df-rel 4590  df-cnv 4591  df-co 4592  df-dm 4593  df-fun 5169  df-fn 5170
This theorem is referenced by: (None)
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