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	$$⊢1\in ℝ$$
2	1	ltp1i	$$⊢1<1+1$$
3		df-2	$$⊢2=1+1$$
4	2 3	breqtrri	$$⊢1<2$$