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Discrete Math

On a resilience version of the Littlewood-Offord problem

Location:  Hill 705
Date & time: Monday, 10 October 2016 at 2:00PM -

Asaf Ferber, MIT

"On a resilience version of the Littlewood-Offord problem"

Time: 2:00 PM
Location: Hill 705
Abstract: In this talk we consider a resilience version of the classical Littlewood-Offord problem. That is, consider the sum X=a_1x_1+...a_nx_n, where the a_i-s are non-zero reals and x_i-s are i.i.d. random variables with P(x_1=1)=P(x_1=-1)=1/2. Motivated by some problems from random matrices, we consider the question: how many of the x_i-s can we typically allow an adversary to change without making X=0? We solve this problem up to a constant factor and present a few interesting open problems. Joint with: Afonso Bandeira (NYU) and Matthew Kwan (ETH, Zurich).

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