Metamath Proof Explorer

Theorem 1le1

Description: One is less than or equal to one. (Contributed by David A. Wheeler, 16-Jul-2016)

Ref Expression
Assertion 1le1 
|- 1 <_ 1

Proof

Step Hyp Ref Expression
1 1re 
 |-  1 e. RR
2 1 leidi 
 |-  1 <_ 1