Theorem 3cn

Description: The number 3 is a complex number. (Contributed by FL, 17-Oct-2010) Reduce dependencies on axioms. (Revised by Steven Nguyen, 4-Oct-2022)

	Ref	Expression
Assertion	3cn	$$⊢3\in ℂ$$

Proof

Step	Hyp	Ref	Expression
1		df-3	$$⊢3=2+1$$
2		2cn	$$⊢2\in ℂ$$
3		ax-1cn	$$⊢1\in ℂ$$
4	2 3	addcli	$$⊢2+1\in ℂ$$
5	1 4	eqeltri	$$⊢3\in ℂ$$