Ciro Santilli @cirosantilli 40

A Linear map where the image is the underlying field of the vector space, e.g. ${\mathbb{R}}^n\to \mathbb{R}$.

The set of all linear forms over a vector space forms another vector space called the dual space.

The best package ever is: pypi.org/project/china-dictatorship/ see also: cirosantilli.com/china-dictatorship/mirrors

Someone attempted a Wikipedia page apparently: en.wikipedia.org/wiki/Q-CTRL. Nice try, nice try.

A way to defined geometry without talking about coordinates, i.e. like Euclid's Elements, notably Euclid's postulates, as opposed to Descartes's Real coordinate space.

Two are riculously well known: