Theorem 1p2e3ALT

Description: Alternate proof of 1p2e3 , shorter but using more axioms. (Contributed by David A. Wheeler, 8-Dec-2018) (New usage is discouraged.) (Proof modification is discouraged.)

	Ref	Expression
Assertion	1p2e3ALT	$$⊢1+2=3$$

Proof

Step	Hyp	Ref	Expression
1		2cn	$$⊢2\in ℂ$$
2		ax-1cn	$$⊢1\in ℂ$$
3		2p1e3	$$⊢2+1=3$$
4	1 2 3	addcomli	$$⊢1+2=3$$