MATH+ and École Polytechnique (l’X, Paris) are reinforcing their ties and expanding their scientific collaboration. The partners signed a Memorandum of Understanding (MoU) on 24 March 2026, during a visit by a delegation from the Chair of MATH+ to l’X.

Researchers have overturned a 150-year-old rule in classical geometry, originally proposed by Pierre Ossian Bonnet, which claimed a surface is uniquely determined by its metric and mean curvature. They constructed two distinct donut-shaped surfaces sharing both properties, creating the first compact ‘Bonnet pair’ and disproving the long-accepted principle.

In the second interview with the 2025 Hanna Neumann Fellows (HNF), Monika from the Indian Statistical Institute in Kolkata, India, and Alice from the Hausdorff Center for Mathematics (HCM) in Bonn, share insights from their research stay in Berlin in 2025. They also reflect on their research focus, collaborations, and future plans.

Two “Young African Mathematician” Fellows share their academic journeys and first impressions of Berlin. In this interview, Kessel and Manuella talk about research and teaching cultures in Germany and Cameroon, life abroad in a new city, and their ambitions to pursue a PhD and make future impact in Africa.

650 Gewinner*innen der Mathe-Adventskalender von Mathe-im-Advent und MATH+ wurden am 23.01.2026 an der Freien Universität Berlin gefeiert. Vom 1.–24. Dezember lösten sie täglich mathematische Rätselaufgaben rund um das Thema „Energie der Zukunft“. Über 190.000 Teilnehmende aus ca. 70 Ländern und 8.000 Schulen beteiligten sich an den beiden Adventskalendern.

MATH+ scientists analyzed the 2022 mpox outbreak. At its peak in Berlin, over 200 new weekly cases were reported, mainly among men who have sex with men (MSM). Using mathematical simulations, the team examined contact patterns, behavior changes, immunity and vaccination that shaped the outbreak. The study was published in Communications Medicine.