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Theorem dmmptif 46417
Description: Domain of the mapping operation. (Contributed by Glauco Siliprandi, 21-Dec-2024.)
Hypotheses
Ref Expression
dmmptif.1 Ⅎ𝑥𝐴
dmmptif.2 𝐵 ∈ V
dmmptif.3 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
Assertion
Ref Expression
dmmptif dom 𝐹 = 𝐴

Proof of Theorem dmmptif
StepHypRef Expression
1 dmmptif.1 . . 3 Ⅎ𝑥𝐴
2 dmmptif.2 . . 3 𝐵 ∈ V
3 dmmptif.3 . . 3 𝐹 = (𝑥 ∈ 𝐴 ↦ 𝐵)
41, 2, 3fnmptif 46416 . 2 𝐹 Fn 𝐴
5 fndm 6650 . 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 1569   ∈ wcel 2146  Ⅎwnfc 2910  Vcvv 3453   ↦ cmpt 5188  dom cdm 5654   Fn wfn 6541
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-10 2179  ax-11 2196  ax-12 2215  ax-ext 2735  ax-sep 5251  ax-pr 5394
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-nf 1816  df-sb 2101  df-mo 2567  df-eu 2597  df-clab 2742  df-cleq 2755  df-clel 2838  df-nfc 2912  df-ral 3080  df-rex 3090  df-rab 3416  df-v 3455  df-ss 3900  df-dif 4049  df-in 4093  df-un 4153  df-nul 4281  df-if 4485  df-sn 4588  df-pr 4590  df-op 4838  df-br 5106  df-opab 5170  df-mpt 5189  df-id 5549  df-xp 5660  df-rel 5661  df-cnv 5662  df-co 5663  df-dm 5664  df-fun 6548  df-fn 6549
This theorem is used by:  adddmmbl2  47983  muldmmbl2  47985  smfdivdmmbl2  47990
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