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 e. CC

Proof

Step	Hyp	Ref	Expression
1		df-3	|- 3 = ( 2 + 1 )
2		2cn	|- 2 e. CC
3		ax-1cn	|- 1 e. CC
4	2 3	addcli	|- ( 2 + 1 ) e. CC
5	1 4	eqeltri	|- 3 e. CC