Metamath Proof Explorer


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