Christiane Tretter

Christiane Tretter is a German mathematician and mathematical physicist who works as a professor in the Mathematical Institute (MAI) of the University of Bern in Switzerland, and as co-director of the institute. Her research area in applied analysis includes, in particular, spectral theory and differential operators.

Education and career Tretter studied mathematics, with a minor in physics, at the University of Regensburg, earning a diploma in 1989, a Ph.D. in 1992, and a habilitation in 1998. Her doctoral dissertation, Asymptotische Randbedingungen für Entwicklungssätze bei Randeigenwertproblemen zu mit -abhängigen Randbedingungen, was supervised by Reinhard Mennicken.

She became a lecturer at the University of Leicester in 2000, moved to the University of Bremen as a professor in 2002, and took her present position as full professor at the University of Bern in 2006.

Since 2008 she has been editor-in-chief of the journal Integral Equations and Operator Theory.. Having served as vice-president of the Swiss Mathematical Society, SMS, in 2024/25, she was elected president of SMS in 2026.

Books Tretter is the author of two mathematical monographs, Spectral Theory of Block Operator Matrices and Applications (2008) and On Lambda-Nonlinear-Boundary-Eigenvalue-Problems (1993), and of two textbooks in analysis.

Recognition Tretter was awarded the Richard von Mises Prize of the Gesellschaft für Angewandte Mathematik und Mechanik, GAMM, in 1995. She became honorary member of the Swedish Mathematical Society in 2025.