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+0 and −0

You can approach zero from the positive, you then write x→0+, and you can approach it from the negative, you then write x→0.

 


Explanation

For the positive number c applies

     and     

This can have a big impact.

 


Example 1

A unilateral function can have two different results

     and     

That is surprising. So we better check it

and

 


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