Discrete Geometric Structure Seminar
Double points and free deletions of plane arrangementse
Takuro Abe (Kyushu University)
2021/11/17 (Wed), 15:00-16:00 (Room 4-501)
Abstract: The relation between free arrangements and double points are recently revealed that has connections with Sylvester-Gallai theorem and Dirac-Motzkin conjecture. We proceed this research more on free deletions and double points. Moreover, we study the all removable arrangements, i.e., that is a free arrangement such that any deletion is free like Weyl arrangement.