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Theorem dmmptif 46041
Description: Domain of the mapping operation. (Contributed by Glauco Siliprandi, 21-Dec-2024.)
Hypotheses
Ref Expression
dmmptif.1 𝑥𝐴
dmmptif.2 𝐵 ∈ V
dmmptif.3 𝐹 = (𝑥𝐴𝐵)
Assertion
Ref Expression
dmmptif dom 𝐹 = 𝐴

Proof of Theorem dmmptif
StepHypRef Expression
1 dmmptif.1 . . 3 𝑥𝐴
2 dmmptif.2 . . 3 𝐵 ∈ V
3 dmmptif.3 . . 3 𝐹 = (𝑥𝐴𝐵)
41, 2, 3fnmptif 46040 . 2 𝐹 Fn 𝐴
5 fndm 6642 . 2 (𝐹 Fn 𝐴 → dom 𝐹 = 𝐴)
64, 5ax-mp 5 1 dom 𝐹 = 𝐴
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   = wceq 1570  wcel 2146  wnfc 2912  Vcvv 3457  cmpt 5194  dom cdm 5663   Fn wfn 6535
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 2148  ax-9 2156  ax-10 2179  ax-11 2195  ax-12 2216  ax-ext 2737  ax-sep 5259  ax-pr 5406
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 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ral 3082  df-rex 3092  df-rab 3419  df-v 3459  df-dif 3909  df-un 3911  df-in 3913  df-ss 3923  df-nul 4287  df-if 4490  df-sn 4592  df-pr 4594  df-op 4598  df-br 5112  df-opab 5176  df-mpt 5195  df-id 5558  df-xp 5669  df-rel 5670  df-cnv 5671  df-co 5672  df-dm 5673  df-fun 6542  df-fn 6543
This theorem is used by:  adddmmbl2  47608  muldmmbl2  47610  smfdivdmmbl2  47615
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