Metamath Proof Explorer

Theorem 1t1e1

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

Ref Expression
Assertion 1t1e1 
|- ( 1 x. 1 ) = 1

Proof

Step Hyp Ref Expression
1 ax-1cn 
 |-  1 e. CC
2 1 mulid1i 
 |-  ( 1 x. 1 ) = 1