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Theorem s1dmg 11393
Description: The domain of a singleton word is a singleton. (Contributed by AV, 9-Jan-2020.)
Assertion
Ref Expression
s1dmg (𝐴𝑆 → dom ⟨“𝐴”⟩ = {0})

Proof of Theorem s1dmg
StepHypRef Expression
1 s1val 11385 . . 3 (𝐴𝑆 → ⟨“𝐴”⟩ = {⟨0, 𝐴⟩})
21dmeqd 4983 . 2 (𝐴𝑆 → dom ⟨“𝐴”⟩ = dom {⟨0, 𝐴⟩})
3 dmsnopg 5259 . 2 (𝐴𝑆 → dom {⟨0, 𝐴⟩} = {0})
42, 3eqtrd 2271 1 (𝐴𝑆 → dom ⟨“𝐴”⟩ = {0})
Colors of variables:    wff set class
This proof depends on syntax axioms:  wi 4   = wceq 1402  wcel 2209  {csn 3709  cop 3712  dom cdm 4774  0cc0 8179  ⟨“cs1 11383
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-br 4131  df-opab 4193  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-iota 5337  df-fun 5379  df-fv 5385  df-s1 11384
This theorem is used by: (None)
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