GeoThms — a Web System for Euclidean Constructive Geometry

GeoThms is a web-based framework for exploring geometrical knowledge that integrates Dynamic Geometry Software (DGS), Automatic Theorem Provers (ATP), and a repository of geometrical constructions, figures and proofs. The GeoThms users can easily use/browse through existing geometrical content and build new contents. In this paper we describe GeoThms functionalities, focusing on the interface solutions required for a system aimed at supporting studying and teaching geometry via Internet. GeoThms is a publicly accessible system with a growing body of geometrical constructions and formally proven geometrical theorems. We believe that, with the help of all its users it will become an important Internet resource for geometry.