Limits of tangent spaces to definable hypersurfaces

Time: 10:00 to  11:30 Ngày 23/01/2019

Venue/Location: C2-714, VIASM

Speaker: Đinh Sĩ Tiệp


In this talk, we study the set of tangent limits in the tangent cone at a given point of definable hypersurfaces in any o-minimal structure by characterizing the set of "exceptional rays" and investigating the set of tangent limits along these rays. The main result of the talk, whose proof is elementary, generalize the result of Oshea and Wilson which deals with the case of algebraic surfaces.