Expansion for the product of matrices in groups

Authors: Doowon Koh, Phạm Văn Thắng, Chun-Yen Shen, Lê Anh Vinh,

https://doi.org/10.1515/forum-2018-0063

Publisher, magazine: ,

Publication year: 2019

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Abstract

In this paper, we give strong lower bounds on the size of the sets of products of matrices in some certain groups. More precisely, we prove an analogue of a result due to Chapman and Iosevich for matrices in SL2(𝔽p) with restricted entries on a small set. We also provide extensions of some recent results on expansion for cubes in Heisenberg group due to Hegyvári and Hennecart.

Tags: Matrix, finite fields, expanders