Theories in and of Mathematics Education

1. Introduction
Angelika Bikner-Ahsbahs

2. Theories in Mathematics Education as a Scientific Discipline
Angelika Bikner-Ahsbahs, Andreas Vohns

3. Joachim Lompscher and His Activity Theory Approach Focusing on the Concept of Learning Activity and How It Influences Contemporary Research in Germany
Regina Bruder, Oliver Schmitt

4. Signs and Their Use: Peirce and Wittgenstein
Willi Dörfler

5. Networking of Theories in the Tradition of TME
Angelika Bikner-Ahsbahs

6. Summary and Looking Ahead
Angelika Bikner-Ahsbahs, Andreas Vohns

Avainsanat: Education, Mathematics Education, Learning & Instruction, Semiotics