Towards an Electronic Geometry Textbook -- Equidecomposable Quadratic Regions -- Automatic Verification of Regular Constructions in Dynamic Geometry Systems -- Recognition of Computationally Constructed Loci -- Algorithmic Search for Flexibility Using Resultants of Polynomial Systems -- Cylinders Through Five Points: Complex and Real Enumerative Geometry -- Detecting All Dependences in Systems of Geometric Constraints Using the Witness Method -- Automatic Discovery of Geometry Theorems Using Minimal Canonical Comprehensive Gröbner Systems -- Mechanical Theorem Proving in Tarski’s Geometry -- On the Need of Radical Ideals in Automatic Proving: A Theorem About Regular Polygons -- A Maple Package for Automatic Theorem Proving and Discovery in 3D-Geometry -- Geometry Expressions: A Constraint Based Interactive Symbolic Geometry System -- Constructing a Tetrahedron with Prescribed Heights and Widths.