Metamath Proof Explorer


Theorem 1t1e1

Description: 1 times 1 equals 1. (Contributed by David A. Wheeler, 7-Jul-2016)

Ref Expression
Assertion 1t1e1 1 1 = 1

Proof

Step Hyp Ref Expression
1 ax-1cn 1
2 1 mulid1i 1 1 = 1