Theorem 9pos

Description: The number 9 is positive. (Contributed by NM, 27-May-1999) (Proof shortened by Umit Teoman Dogan, 10-Jun-2026)

	Ref	Expression
Assertion	9pos	$$⊢0<9$$

Proof

Step	Hyp	Ref	Expression
1		9nn	$$⊢9\in \mathbb{N}$$
2	1	nngt0i	$$⊢0<9$$