In a previous paper we have introduced the ortho-homological triangles, which are triangles that are orthological and homological simultaneously.

This book contains 21 papers of plane geometry. It deals with various topics, such as: quasi-isogonal cevians, nedians, polar of a point with respect to a circl

The book is addressed to both those who have studied and love geometry, as well as to those who discover it now, through study and training, in order to obtain

The Geometry and Topology of Coxeter Groups is a comprehensive and authoritative treatment of Coxeter groups from the viewpoint of geometric group theory. Group