[dreamcompiler]

Fair point. The mathematical process of differentiation is always straightforward even if in some cases one ends up with e.g. /0 singularities.

With integration, there's often no closed-form process at all, as the author points out.

[inigyou]

On the other hand, integration is numerically well-defined for piecewise continuous functions, while differentiation isn't and may result in nothing useful. Derivative of a square wave is constant zero with some gaps.