Activities This Week
AGNT
DGAs with polynomial homology
Nov 20, 15:10—16:25, 2019, -101
Speaker
Haldun Özgür Bayindir (Haifa)
Abstract
Differential graded algebras(DGAs) are one of the most important objects of study in homological algebra. These are chain complexes with an associative and unital multiplication. Examples of DGAs include cochain complexes of topological spaces equipped with the cup product.
In this talk, I present our recent classification results on DGAs with polynomial homology. These results are obtained by exploiting interesting interactions between DGAs and stable homotopy theory. I am going to start my talk by stating these classification results. For the rest of the talk, I am going to present how stable homotopy theory comes into play for the classification of DGAs. This presentation is going to be accessible to a general audience.
BGU Probability and Ergodic Theory (PET) seminar
On the failure of Ornstein’s theory in the finitary category.
Nov 21, 11:10—12:00, 2019, -101
Speaker
Uriel Gabor (The Hebrew University)
Abstract
I’ll show the invalidity of finitary counterparts for three theorems in classification theory: The preservation of being a Bernoulli shift through factors, Sinai’s factor theorem, and the weak Pinsker property. This gives a negative answer to an old conjecture and to a recent open problem.
Colloquium
On bounded continuous solutions of the archetypal equation with rescaling
Nov 26, 14:30—15:30, 2019, Math -101
Speaker
Gregory Defel (BGU)
אשנב למתמטיקה
חבורות והצגות שלהן פוגשות קבוצות קמורות
Nov 26, 16:10—17:30, 2019, אולם 101-
Speaker
איתן סייג
Abstract
טרנספורם רדון הוא כלי מתמטי בעל חשיבות רבה ברפואה ובהנדסה. נציג את הטרנספורם ואת המתמטיקה מאחורי נוסחת ההיפוך. אחר כך נפנה לשימוש בסימטריות, חבורות והצגות שלהן כדי ללכסן את הטרנספורם ולהראות כי הוא הפיך. בדרך נפגוש את הלמה של Schur את הלפלסיאן וגם גזירה שבורה של פונקציות.