Theorem 1lt2

Description: 1 is less than 2. (Contributed by NM, 24-Feb-2005)

	Ref	Expression
Assertion	1lt2	|- 1 < 2

Proof

Step	Hyp	Ref	Expression
1		1re	|- 1 e. RR
2	1	ltp1i	|- 1 < ( 1 + 1 )
3		df-2	|- 2 = ( 1 + 1 )
4	2 3	breqtrri	|- 1 < 2