Theorem 1ne2

Description: 1 is not equal to 2. (Contributed by NM, 19-Oct-2012)

	Ref	Expression
Assertion	1ne2	$$⊢1\ne 2$$

Proof

Step	Hyp	Ref	Expression
1		1re	$$⊢1\in ℝ$$
2		1lt2	$$⊢1<2$$
3	1 2	ltneii	$$⊢1\ne 2$$