2019

The rank of sparse random matrices

Coja-Oghlan, Amin, Ergür, Alperen A., Gao, Pu et al.

Understand

We determine the rank of a random matrix over an arbitrary field with prescribed numbers of non-zero entries in each row and column.

  • As an application we obtain a formula for the rate of low-density parity check codes.
  • This formula vindicates a conjecture of Lelarge (2013).
  • The proofs are based on coupling arguments and a novel random perturbation, applicable to any matrix, that diminishes the number of short linear relations.

Reading the bibliography…