Theorem 1ne3

Description: 1 is not equal to 3 . (Contributed by Jiamin Zhao, 1-Aug-2026)

	Ref	Expression
Assertion	1ne3	$$⊢1\ne 3$$

Proof

Step	Hyp	Ref	Expression
1		1re	$$⊢1\in ℝ$$
2		1lt3	$$⊢1<3$$
3	1 2	ltneii	$$⊢1\ne 3$$