A Singularity: Finite Function, Infinite Derivatives

[atrahasis]

Hi,

Do you know the name of this kind of singularity at A ?
The function is finite but the left derivative is $+\infty$ and the right derivative is $-\infty$.

http://shareimage.org/viewer.php?file=mt79897bbpxxse1v8pzb.jpg

Thanks

 

[SteveL27]

Hi,

Do you know the name of this kind of singularity at A ?
The function is finite but the left derivative is $+\infty$ and the right derivative is $-\infty$.

http://shareimage.org/viewer.php?file=mt79897bbpxxse1v8pzb.jpg

Thanks

Cusp.

http://en.wikipedia.org/wiki/Cusp_(singularity)

 

[atrahasis]

thanks