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Normal forms of flat cuspidal edges and flat swallowtails in Euclidean 3-space
时间:2026年10月12日 19:40 点击数:

报告人:于海鸥

报告地点:人民大街校区数学与统计学院317教室

报告时间:2026年10月21日星期三 16:00-17:00

邀请人:裴东河

报告摘要:

In this talk, we investigate the local differential geometry of wave fronts and frontals. Wave fronts and frontals are surfaces in Euclidean 3-space and may admit singularities. Normal forms are widely adopted to explore the local differential geometry of singular surfaces. On the other hand, a framed surface is a smooth surface in Euclidean 3-space with a moving frame. Using the moving frame, the basic invariants and curvatures of framed surfaces are introduced. Combining the theories of the normal forms and the framed surfaces, we derive not only the normal forms for the infinite-type case of real analytic flat cuspidal edges and swallowtails, but also those for the finite-type case. Moreover, a real analytic cuspidal cross cap is never a flat surface.

主讲人简介:

于海鸥,吉林财经大学统计与数据科学学院,副教授。主要研究领域为奇点理论在微分几何中的应用。

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