Theorem 5lt6

Description: 5 is less than 6. (Contributed by Mario Carneiro, 15-Sep-2013)

	Ref	Expression
Assertion	5lt6	|- 5 < 6

Proof

Step	Hyp	Ref	Expression
1		5re	|- 5 e. RR
2	1	ltp1i	|- 5 < ( 5 + 1 )
3		df-6	|- 6 = ( 5 + 1 )
4	2 3	breqtrri	|- 5 < 6