Änderungen

== Arbeitsgebiete ==

== Arbeitsgebiete ==

<!-- Beschreibung der Arbeitsgebiete, möglichst mit [[...]] auf die Enzyklopädie verweisen -->

<!-- Beschreibung der Arbeitsgebiete, möglichst mit [[...]] auf die Enzyklopädie verweisen -->

(more than 100 publications in reviewed journals)

*Stoffdidaktik (didactics of teaching materials) and problem solving activities, e.g., the representation mode of problems

*Discrete mathematics, algebra, optimization theory; cooperation projects with e.g. Thyssen- Krupp Steel

*CPD viewed from an international perspective

*Knowledge representation and electronic publishing; cooperation with libraries; electronic dis- sertations and thesis-initiative (EDT)

*Mathematics education: content matter knowledge (calculus, linear algebra); problem solving; mathematical beliefs and their influence on teaching and learning; epistemological cognition

*subjective theories of teaching and learning.

== Projekte ==

== Projekte ==