Theorem zssq

Description: The integers are a subset of the rationals. (Contributed by NM, 9-Jan-2002)

	Ref	Expression
Assertion	zssq	⊢ ℤ ⊆ ℚ

Proof

Step	Hyp	Ref	Expression
1		zq	⊢ ( 𝑥 ∈ ℤ → 𝑥 ∈ ℚ )
2	1	ssriv	⊢ ℤ ⊆ ℚ