OCAMI Colloquium (2025)
List of OCAMI Colloquium by Year
| Date | March 17(Tue.), 2026, 15:00-16:00 |
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| Speaker | Takayuki Koike (Osaka Metropolitan University) |
| Title | The complex geometry of weak and strong pseudoconvexity |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | In the theory of functions of several complex variables, one of the central themes has long been the question of how far holomorphic functions can be analytically continued, and how one can characterize domains that are, in some sense, natural domains of definition beyond which no further continuation is possible. Through the study of phenomena markedly different from those in one complex variable, as typified by the Hartogs phenomenon, these questions have naturally expanded beyond the theory of domains in complex Euclidean spaces to the setting of general complex manifolds and complex spaces, and are now understood geometrically as problems concerning pseudoconvexity. In the first half of this talk, I will give a brief historical overview of this development. In the second half, I will focus on the difference between weak and strong pseudoconvexity on general complex manifolds. While strong pseudoconvexity fits well with the classical theory, weak pseudoconvexity exhibits subtler and richer geometry, closely related in particular to Levi-flat phenomena. Through concrete examples, I will explain the meaning of this contrast and, with comparisons to results of Andreotti--Grauert type in mind, introduce some recent topics in the complex geometry of weakly pseudoconvex domains./td> |
| Registration | Please register by 9:00 on March 17 Speakers: Prof. Koike and Prof. Kato Registration Form |
| Note | |
| Date | March 17(Tue.), 2026, 16:30-17:30 |
| Speaker | Shin Kato(Osaka Metropolitan University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus |
| Abstract | Japanese page only |
| Note | No online streaming (Zoom) will be provided. |
| Date | November 26(Wed.), 2025, 17:00-18:00 |
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| Speaker | Takenori Kataoka(Tokyo University of Science) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on November 26 Registration Form |
| Note |
| Date | October 22 (Wed.), 2025, 17:00-18:00 |
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| Speaker | Kazuma Shimomoto (Institute of Science Tokyo) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on October 22 Registration Form |
| Note |
| Date | September 2(Tue.), 2025, 17:00-18:00 |
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| Speaker | Takahiro Matsushita (Shinshu University) |
| Title | On the embeddability of skeleta of manifold triangulations |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | It is well known that every finite d-dimensional simplicial complex can be embedded in R^{2d+1}. On the other hand, by the classical van Kampen-Flores theorem there exists a finite d-dimensional simplicial complex that cannot be embedded in R^{2d}. In this talk, we discuss the embeddability of the d-skeleton of simplicial complexes obtained as triangulations of manifolds, into R^{2d}. This is joint work with Daisuke Kishimoto (Kyushu University). |
| Registration | Please register by 9:00 on September 2 Registration Form |
| Note |
| Date | June 19 (Thu.), 2025, 17:00-18:00 |
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| Speaker | Hisashi Morioka (Ehime University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Please register by 9:00 on June 19 Registration Form |
| Note |
| Date | June 12 (Thu.), 2025, 15:45-16:45 Lecture 1 |
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| Speaker | Yeonhee Jang (Osaka Metropolitan University) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Registration for Participation on June 12 Registration Form Please register by 9:00 on June 12 |
| Note | |
| Date | June 12(Thu.), 2025, 17:00-18:00 Lecture 2 |
| Speaker | Kimball MARTIN (Osaka Metropolitan University) |
| Title | Statistics in Number Theory |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Many basic objects in number theory, such as prime numbers, do not follow any regular patterns. However, they typically obey certain statistical laws - some of which are less obvious than others. I will first discuss some aspects of the distribution of prime numbers, explaining how they behave like random numbers in some ways but not others. Then I will discuss the distribution of other key objects in number theory, namely elliptic curves and modular forms. |
| Registration | |
| Note |
| Date | June 2(Mon.), 2025, 15:30-16:30 Lecture 1 |
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| Speaker | Takuma Hayashi (OCAMI) |
| Title | Real structures in linear algebra, geometry and representation theory |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | Registration for Participation on June 2 Registration Form Please register by 9:00 on June 2 |
| Note | |
| Date | June 2(Mon.), 2025, 16:40-17:40 Lecture 2 |
| Speaker | Jumpei Yasuda (OCAMI) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | |
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| Date | June 2(Mon.), 2025, 17:50-18:50 Lecture 3 |
| Speaker | Toshiya Yurikusa (OCAMI) |
| Title | Japanese page only |
| Place | Room E408, Science Building E, Sugimoto Campus & Zoom |
| Abstract | Japanese page only |
| Registration | |
| Note |