پژوهشگاه دانش‌های بنیادی
پژوهشکدهٔ ریاضیات

Mathematics Colloquium سمینار عمومی ریاضیات

Ziggurats and Rotation Numbers

Danny Calegari  
University of Chicago  

Wednesday, June 20, 2018,   16:00 - 17:00

VENUE   Lecture Hall 1, Niavaran Bldg.



The dynamical study of homeomorphisms of the circle is more than a century old; for a single homeomorphism Poincare found a beautiful invariant - the rotation number. In this talk we address the following fundamental question: if we know the rotation numbers of two homeomorphisms of the circle, what can we say about the rotation number of their product?


تهران، ضلع‌ جنوبی ميدان شهيد باهنر (نياوران)، پژوهشگاه دانش‌های بنيادی، پژوهشکده رياضيات
School of Mathematics, Institute for Research in Fundamental Sciences (IPM), Niavaran Bldg., Niavaran Square, Tehran
ipmmath@ipm.ir   ♦   +98 21 22290928   ♦  math.ipm.ir