Theorem 1ne2

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

	Ref	Expression
Assertion	1ne2	⊢ 1 ≠ 2

Proof

Step	Hyp	Ref	Expression
1		1re	⊢ 1 ∈ ℝ
2		1lt2	⊢ 1 < 2
3	1 2	ltneii	⊢ 1 ≠ 2