第89回

• 日時：2026年2月18日（水）15:10～（60分+質疑応答の予定）
• 場所：青山学院大学 理工学部 相模原キャンパス（O棟1階 O122b） （通常と異なるのでご注意ください）
• 講師：Gerard Misiolek 氏 (University of Norte Dame)
• 題目：Hydrodynamics as a model of an infinite-dimensional Riemannian geometry
• Abstract: There are two main approaches to study nonlinear equations of fluid dynamics pedigree: Eulerian and Lagrangian. The former can be viewed as "high-tech" as it is typically based on technical PDE estimates in various (more or less exotic) function spaces. The latter is more “basic” and leads to a coherent geometric picture which can serve as a rough intuitive guide. It also offers certain technical advantages - eg. when it comes to questions involving regularity of the associated solution maps. I will try to illustrate this last point in the case of the incompressible Euler equations of ideal hydrodynamics.