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 ∈ ℕ0
Assertion	nn0cni	⊢ 𝐴 ∈ ℂ

Proof

Step	Hyp	Ref	Expression
1		nn0rei.1	⊢ 𝐴 ∈ ℕ0
2		nn0sscn	⊢ ℕ0 ⊆ ℂ
3	2 1	sselii	⊢ 𝐴 ∈ ℂ