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database system engineers

Papers whose findings have a practical use for this group, as judged from the abstract. Open a paper to read what it means in practice.

Binary rank limits found for matrices with fixed real rank

On the Binary Rank of Matrices with Constant Real Rank

Abstract: We continue the study initiated by Parnas and Shraibman~\cite{PARNAS2026264} who gave upper bounds on the binary rank of $0,1$ matrices which have a small rank over the reals. We give alternative completely mathematical proofs of results proved in~\cite{PARNAS2026264} with the assistance of a computer program, and also solve one of the open problems presented there regarding the maximal binary rank of a matrix with real rank $5$. Moreover, our techniques provide a general method for giving non-trivial upper bounds on the maximal binary rank of a matrix with constant real rank. Our results also imply bounds on the equivalent problem of finding the minimum number of bicliques needed to partition the edges of a bipartite graph whose reduced adjacency matrix has real rank at most $d$.

Thu 24 SeptDiscrete Mathematics
The gist
Some math researchers studied a special kind of matrix that contains only zeros and ones but also has a fixed rank when using normal real numbers. They found new ways to show upper limits on the ‘binary rank’, which measures how complex the matrix is in a different way. They solved an open problem for matrices with real rank 5 and created general methods that work for other fixed ranks too. Their work also relates to how we can break down connections in certain graphs efficiently.
Open → 2609.30203v1