Mathematical Institute of the University of Bonn

© Foto: HCM / Barbara Frommann

Endenicher Allee 60 53115 Bonn Office 3.006 E-mail: schroer@etc Tel.:0228-737786 Secretary: U. Müller-Moewes Office 4.011 E-mail: m-moewes@etc Tel.: 0228-732947 (etc = math.uni-bonn.de)

Research Interests Representation theory of finite-dimensional algebras and quivers Geometry of module varieties and quiver Grassmannians Cluster algebras and their categorifications Preprojective algebras Biserial algebras Kac-Moody Lie algebras and quantum groups (e.g. geometric realizations of crystal graphs, and semicanonical bases)

My opinion on Covid19 vaccinations and Covid measures:

• Every adult and minor from the age of 12 should get vaccinated against Covid19.
• It is now (August 2021 in Bonn) trivial to get an instant appointment for a vaccination.
• There will be no prepandemic teaching and learning conditions unless all members of the University (students and staff) are fully vaccinated.
• People who are not fully vaccinated (or recently recovered) should not be allowed to enter a University building or attend a class in person. (Tests are not enough.) In other words, I'm an advocate for the ''2g rule'' (instead of the still more common ''3g rule'').
• All Universities should allow classes for fully vaccinated students (possibly combined with additional measures like masks, and/or tests) without imposing a limit on the number of participants. If we cannot accept the remaining risks, we will never return to life as we knew it.
• I encourage the students to voice their opinion on this. If you don't speak up, no one will hear you.