In this new version of my article Modular fundamental domain I added remarks on Helena VERRILL’s fundamental domain drawer, in particular minor changes to the class FunDomain, removing deprecated code for java version 10.
In this new version of my article Spherical design with METAPOST I replaced several calculations by concepts and added in the astronomical application section the handling of orthogonal projections of orbits in space.
Vor 80 Jahren hat Piet Hein die Soma Würfel erfunden — in dem Artikel Soma Würfel werden sie mit einigen METAPOST Zeichnungen beschrieben.
Réédition du Séminaire de Géométrie Algébrique d’Orsay de l’année scolaire 1969/70.
The hull speed of a displacement boat is the maximal attainable
speed and is determined by the wave system generated by the displacement.
It is proportional to the square root of the length of the waterline:
v = R * √L where L designates the length of the waterline
This article wave speed explains the formula and the factor R.
Plane curves of 2. order (conic sections) treated by their invariants. More …