Metamath Proof Explorer


Theorem 1le2

Description: 1 is less than or equal to 2. (Contributed by David A. Wheeler, 8-Dec-2018)

Ref Expression
Assertion 1le2 1 2

Proof

Step Hyp Ref Expression
1 1re 1
2 2re 2
3 1lt2 1 < 2
4 1 2 3 ltleii 1 2