Dijen K. Ray-Chaudhuri works on combinatorial design theory. With Richard M. Wilson, he proved bounds linking design parameters and the permitted intersection sizes of blocks.[ref]
On t-designs by Dijen K. Ray-Chaudhuri and Richard M. Wilson. Original byline and introduction
The Ray-Chaudhuri–Wilson theorem bounds a uniform family of subsets when distinct members have only a limited number of intersection sizes. The proof encodes those restrictions in polynomials and uses linear independence to compare the family size with a finite-dimensional function space. Algebra thereby constrains a purely combinatorial configuration.[ref]
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Dijen K. Ray-Chaudhuri, commonly referred to as D. K. Ray-Chaudhuri, is a mathematician known for his contributions to the fields of combinatorics and coding theory. He has made significant advancements in areas such as linear codes, weighted codes, and combinatorial designs. Ray-Chaudhuri's research often focuses on the interplay between algebra and combinatorial structures.