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Metamath Proof Explorer

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 e. RR
2 1lt2 
 |-  1 < 2
3 1 2 ltneii 
 |-  1 =/= 2