Speaker :	Prof. Sun, Zhi-Wei (Nanjing University)
Title :	Determinants, Permutations and Additive Combinatorics
Time :	2014-07-24 (Thu) 15:00 - 16:00
Place :	Lecture Hall, Inst. of Mathematics
Abstract:	In this talk we will introduce some new problems and related progress on determinants involving Legendre symbols, circular permutations and additive combinatorics. For example, we conjecture that for any finite subset $A$ of an additive abelian group $G$ with $\|A\|=n>3$ there is a circular permutation $a_1,\ldots,a_n$ of the elements of $A$ such that all the $n$ sums $a_1+a_2+a_3,a_2+a_3+a_4,\ldots,a_{n-2}+a_{n-1}+a_n,a_{n-1}+a_n+a_1,a_n+a_1+a_2$ are pairwise distinct. The speaker has proved this for any torsion-free abelian group $G$ , but it is even open for cyclic groups of prime orders.