Theorem zssxr

Description: The integers are a subset of the extended reals. (Contributed by Glauco Siliprandi, 23-Oct-2021)

	Ref	Expression
Assertion	zssxr	⊢ ℤ ⊆ ℝ*

Proof

Step	Hyp	Ref	Expression
1		zssre	⊢ ℤ ⊆ ℝ
2		ressxr	⊢ ℝ ⊆ ℝ*
3	1 2	sstri	⊢ ℤ ⊆ ℝ*