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Tag Archives: Hadamard matrix
A public lecture
This evening, Jonathan Jedwab gave a public lecture, in celebration of the fact that it is Jacques Hadamard‘s 150th birthday. The title of the lecture was “What is a research mathematician?”, and the hook linking the two was Hadamard matrices. … Continue reading
Posted in events
Tagged doing mathematics, Hadamard matrix, Jonathan Jedwab, Paley, Sylvester
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A matrix problem
Suppose you are given n linearly independent vectors in ndimensional Euclidean space. You move the vectors so that each vector becomes longer, but their inner products remain the same. What happens to the volume of the parallelepiped they span? This … Continue reading
Posted in open problems
Tagged conference matrix, Dennis Lin, determinant, Hadamard matrix, Isaac Newton Institute, matrices, skewsymmetric, statistics
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Team games, 1
Laurent asked on my blog: Given n players, arrange a competition in which, in each match, two teams of k players play each other. We require that any two players are on the same team in a fixed number s … Continue reading