Fuglede's spectral-set conjecture.

Analysis Seminar
Wednesday, December 5, 2018 - 1:55pm for 1 hour (actually 50 minutes)
Skiles 005
Rachel Greenfeld – Bar Ilan University
Shahaf Nitzan
A set $\Omega\subset \mathbb{R}^d$ is called spectral if the space $L^2(\Omega)$ admits an orthogonal basis of exponential functions. Back in 1974 B. Fuglede conjectured that spectral sets could be characterized geometrically by their ability to tile the space by translations. Although since then the subject has been extensively studied, the precise connection between spectrality and tiling is still a mystery.>In the talk I will survey the subject and discuss some recent results, joint with Nir Lev, where we focus on the conjecture for convex polytopes.