Theorem 1p1e2

Description: 1 + 1 = 2. (Contributed by NM, 1-Apr-2008)

	Ref	Expression
Assertion	1p1e2	$$⊢1+1=2$$

Proof

Step	Hyp	Ref	Expression
1		df-2	$$⊢2=1+1$$
2	1	eqcomi	$$⊢1+1=2$$