"Geographic Variation in Healthcare Utilization: The Role of Physicians" | Amy Finkelstein (MIT)

Ten minutes for your mind@2:50 every day at 2:50 pm in multiple time zones:Europa@2:50, EET, Athens, Helsinki (UTC+2) (7:50 am EST) https://us02web.zoom.us/j/88298032734Atlantica@2:50, EST, New York, Toronto (UTC-4) https://us02web.zoom.us/j/85349851047Pacifica@2:50, PST, Los Angeles, Vancouver (UTC=7) (5:50 pm EST) https://us02web.zoom.us/j/85743543699Almost everything works better again if you unplug it for a bit, including your mind. Stop by and unplug. Get the benefits of mindfulness without the fuss.@2:50 meets at the same time every single day for ten minutes of quiet together.No pre-requisite, no registration needed.Visit the website to view all @2:50 time zones each day.at250.org or at250.mit.edu

Speaker: Lior Alon (MIT)Title: Periodic Hypersurfaces, Lighthouse Measures, and Lee–Yang PolynomialsAbstract: There is a hierarchy of regularity for continuous ℤ𝑛 -periodic functions in ℝ𝑛 , 𝐶0 ⊃ 𝐶1 ⊃ ⋯ ⊃ 𝐶∞ ⊃ analytic ⊃ trigonomet- ric polynomial, and the decay of the Fourier coefficients pre- cisely reflects this regularity. In particular, the support supp(f̂) is finite if and only if 𝑓 is a trigonometric polynomial. Periodic hypersurfaces in ℝ𝑛 exhibit a similar regularity hierarchy, but there is no analogous Fourier description.In this talk, I will present a joint work with Mario Kummer in which we provide a sufficient Fourier-criterion for a 𝐶1+𝜖 peri- odic hypersurface Σ ⊂ ℝ𝑛 to be the zero set of a trigonomet- ric polynomial of the form 𝑝(𝑒2𝜋𝑖𝑥1, … , 𝑒2𝜋𝑖𝑥𝑛 ) with 𝑝 Lee–Yang polynomial.The criterion can be stated using a recent notion introduced by Yves Meyer: a periodic and positive Radon measure 𝑚 on ℝ𝑛 is a lighthouse measure if supp(𝑚) has zero Lebesgue measure and supp(m̂) is contained in a proper double cone.Our proof relies on the classification of one-dimensional Fourier quasicrystals. No field specific background is assumed. This work is based on collaborations with Alex Cohen, Pavel Kurasov,and Cynthia Vinzant.

"Rebuild or Relocate? Recovery after Natural Disasters" | Shifrah Aron-Dine (UC Berkeley) (joint with Macro)

Shifrah Aron-Dine (UC Berkeley) | joint w/ Environmental