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Workshop on "Higher Geometric Structures along the Lower Rhine XXI", November 26-27, 2026

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Organiser(s): 
Christian Blohmann, Marius Crainic, Ioan Marcut, Ieke Moerdijk, Steffen Sagave
Date: 
Thu, 26/11/2026 - 13:00 - Fri, 27/11/2026 - 17:00
Location: 
MPIM Lecture Hall
Details: 
Program and Abstracts of Workshop on "Higher Geometric Structures along the Lower Rhine XXI", November 26-27, 2026

This is the 21st of a series of  short workshops jointly organized by the Geometry/Topology groups in Bonn, Nijmegen, and Utrecht, all situated along the Lower Rhine. The focus lies on the development and application of new structures in geometry and topology such as Lie groupoids, differentiable stacks, Lie algebroids, generalized complex geometry, topological quantum field theories, higher categories, homotopy algebraic structures, higher operads, derived categories, and related topics.

Conference on "100 Years of Artin's Primitive Root Conjecture"

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Organiser(s): 
Michael Daas, Neelam Kandhil, Pieter Moree, Antonella Perucca
Date: 
Mon, 09/08/2027 - 09:00 - Fri, 13/08/2027 - 12:30
Location: 
MPIM Lecture Hall
Details: 
Program and Abstracts of Conference on "100 Years of Artin's Primitive Root Conjecture"

Conference on "100 Years of Artin's Primitive Root Conjecture", August 9–13, 2027

This conference marks the centenary of Artin's celebrated 1927 conjecture on primitive roots, one of the most influential and enduring open problems in number theory. Over the past century, Artin's conjecture has inspired fundamental developments in both analytic and algebraic number theory, including deep connections with $L$-functions, sieve methods, Galois and Kummer theory, arithmetic statistics, modular forms, and arithmetic geometry.

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