Theorem nn0cni

Description: A nonnegative integer is a complex number. (Contributed by NM, 14-May-2003) Reduce dependencies on axioms. (Revised by Steven Nguyen, 8-Oct-2022)

	Ref	Expression
Hypothesis	nn0rei.1	$$⊢A\in {\mathbb{N}}_0$$
Assertion	nn0cni	$$⊢A\in ℂ$$

Proof

Step	Hyp	Ref	Expression
1		nn0rei.1	$$⊢A\in {\mathbb{N}}_0$$
2		nn0sscn	$$⊢{\mathbb{N}}_0\subseteq ℂ$$
3	2 1	sselii	$$⊢A\in ℂ$$