Theorem 3lt6

Description: 3 is less than 6. (Contributed by Mario Carneiro, 15-Sep-2013)

	Ref	Expression
Assertion	3lt6	⊢ 3 < 6

Proof

Step	Hyp	Ref	Expression
1		3lt4	⊢ 3 < 4
2		4lt6	⊢ 4 < 6
3		3re	⊢ 3 ∈ ℝ
4		4re	⊢ 4 ∈ ℝ
5		6re	⊢ 6 ∈ ℝ
6	3 4 5	lttri	⊢ ( ( 3 < 4 ∧ 4 < 6 ) → 3 < 6 )
7	1 2 6	mp2an	⊢ 3 < 6