= Dijen K. Ray-Chaudhuri
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<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.<On t-designs by Dijen K. Ray-Chaudhuri and Richard M. Wilson>[Original byline and introduction]{ref}
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.<On t-designs by Dijen K. Ray-Chaudhuri and Richard M. Wilson>[Theorem 3, pp. 741–742]{ref}
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