Invariant factors of combinatorial matrices
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The Smith normal forms of an Hadamard matrix of order 4m (m square-free), and of the incidence matrix of a (ν, k, λ) configuration (n=k−λ square-free (n, λ)=1), are determined.
KeywordsProjective Plane National Bureau Incidence Matrix Short Proof Invariant Factor
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© The Weizmann Science Press of Israel 1971