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Faculty of Informatics - Papers (Archive)

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Articles 2011 - 2013 of 2013

Full-Text Articles in Physical Sciences and Mathematics

Two New Block Designs, Jennifer Seberry Jan 1969

Two New Block Designs, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

In this note the matrices W, X. Y, and Z are the incidence matrices of the (u, k, ,\,) configurations (15, 7, 3), (25,9,3), (45, 12,3), and (36, 15,6), respectively. Wand X are new formulations of these configurations and Yand Z were previously not known (see [I, pp. 295, 297]).


A Class Of Hadamard Matrices, Jennifer Seberry Jan 1969

A Class Of Hadamard Matrices, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Whenever there exists a quasi-skew Hadamard matrix of order 4m and (4n - I, k, m - n + k) and (4n - I, u, u - n) configurations with circulant incidence matrices, then there exists an Hadamard matrix of order 4m(4n - I).


Equivalence Of Hadamard Matrices, W. D. Wallis, Jennifer Seberry Jan 1969

Equivalence Of Hadamard Matrices, W. D. Wallis, Jennifer Seberry

Faculty of Informatics - Papers (Archive)

Suppose In is a square-free odd integer, and A and B are any two Hadamard matrices of order 4m. We will show that A and B are equivalent over the integers (that is, B can be obtained from A using elementary row and column operations which involve only integers).