Theorem 11nn

Description: 11 is a positive integer. (Contributed by Umit Teoman Dogan, 10-Jun-2026)

	Ref	Expression
Assertion	11nn	$$⊢11\in \mathbb{N}$$

Proof

Step	Hyp	Ref	Expression
1		1nn0	$$⊢1\in {\mathbb{N}}_0$$
2		1nn	$$⊢1\in \mathbb{N}$$
3	1 2	decnncl	$$⊢11\in \mathbb{N}$$