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Metamath Proof Explorer

Theorem dmuz

Description: Domain of the upper integers function. (Contributed by Glauco Siliprandi, 23-Oct-2021)

		Ref	Expression
	Assertion	dmuz	$⊢ dom ℤ_{\geq} = ℤ$

Step	Hyp	Ref	Expression
1		uzf	$⊢ ℤ_{\geq} : ℤ ⟶ 𝒫 ℤ$
2	1	fdmi	$⊢ dom ℤ_{\geq} = ℤ$