Butterworth Filter Theorie 20230214 10:57:57 
Derivation of the butterworth filter and it's digital implementation

Planes definitions in linear algebra 20220219 21:44:34 
Planes definitions in normal form, derminant and Hesse normal form.

Common operations in linear algebra 20220219 21:26:17 
Definition and geometric interpretation of cross product and scalar triple product.

Distances in linear algebra 20220219 21:26:17 
Distances between points, point and line, two lines and point and plane.
