Theorem 1ne3

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

	Ref	Expression
Assertion	1ne3	|- 1 =/= 3

Proof

Step	Hyp	Ref	Expression
1		1re	|- 1 e. RR
2		1lt3	|- 1 < 3
3	1 2	ltneii	|- 1 =/= 3