# Math Help - need help with differenciable functions

1. ## need help with differenciable functions

describe three ways by which a function can fail to be differentiable

2. Originally Posted by bobby77
describe three ways by which a function can fail to be differentiable
1. It can have a step discontinuity.

2. It can have a corner then the derivative from the left is not equal to
the derivative from the right at the corner.

3. It can have a vertical asymptote where the derivative becomes arbitrary
large as we approach the asymptote.

RonL

3. Originally Posted by CaptainBlack
1. It can have a step discontinuity.

What is that?
Just saying discontinous at a point is good enough.