Asymptotic behaviour of the saturation degree

Prof. Ngo Viet Trung
2024-09-14 10:00-11:00
MCM110

Speaker: Prof. Ngo Viet Trung (Institute of Mathematics, Hanoi, Vietnam)
Time: 10:00-11:00  September 142024 (Saturday)
Venue: MCM110
Title: Asymptotic behaviour of the saturation degree
Abstract: Recently, Ein-Ha-Lazarsfeld proved that if I is a homogeneous ideal whose zero locus is a non-singular complex projective scheme, then the saturation degree sdeg I^n is bounded above by a linear function of n whose slope is less or equal the maximal generating degree of I. Inspired by the asymptotic behavior of the Castelnuovo-Mumford regularity, we show that for an arbitrary graded ideal I in an arbitrary graded ring, sdeg I^n is either a constant or a linear function for n large enough whose slope is one of the generating degrees of I.