Cordian Riener

Cordian Riener is a Professor of Mathematics at UiT The Arctic University of Norway, serving as Pro-Dean for PhD education within the Faculty of Science and Technology. He leads the Algebra group and co-directs the Lie-Størmer Center for Fundamental Structures in Computational and Pure Mathematics. His academic roles include chairing the Norwegian Mathematics Council and membership on the Abel Prize board. Riener holds a Habilitation in Mathematics from Universität Konstanz (2018) and a PhD from Goethe University Frankfurt (2011), with prior roles including Acting Professor at Universität Konstanz and Aalto Science Institute Fellow in Helsinki.

His research focuses on real algebraic geometry, optimization, computational complexity, and symmetry exploitation in algorithms. Notable contributions include work on semidefinite programming, polynomial optimization under symmetry, and cohomology of semi-algebraic sets. Recent publications address connectivity in symmetric sets, orbit space descriptions, and applications of symmetry in trigonometric polynomials. Riener actively organizes conferences like ISSAC and MEGA, and contributes to educational initiatives such as the Norwegian Mathematics Council.