Item 3.3.5.e.

Negation: There is a function which is differentiable and not continuous.

Converse: For all functions \(f\text{,}\) if \(f\) is continuous then \(f\) is differentiable.

Contrapositive: For all functions \(f\text{,}\) if \(f\) is not continuous then \(f\) is not differentiable.