A rotational version of Fick's law of diffusion can be defined.

The original version of the problem is defined for only a single point and its noisy observation.

Single valued versions are defined by choosing a sheet.

The discrete version can be defined on any graph, usually a lattice in d-dimensional Euclidean space.

Its translated (shifted) and dilated (scaled) normalized versions are defined as following.

There are many shades and variations of olive drab; one common version is defined by the FS-595 paint standard.

The periodic version of the Takagi curve can also be defined recursively by:

The version restricted to the unit interval can also be defined recursively by:

An entanglement-based version has been defined as well.

A version of the Schouten-Nijenhuis bracket can also be defined for symmetric multivector fields in a similar way.