On the twin designs with the Ionin-type parameters.
Kharaghani, H. (2000)
The Electronic Journal of Combinatorics [electronic only]
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Displaying similar documents to “Constructing a Canonical form of a Matrix in Several Problems about Combinatorial Designs”
On the twin designs with the Ionin-type parameters.
New symmetric designs from regular Hadamard matrices.
Ionin, Yuri J. (1998)
The Electronic Journal of Combinatorics [electronic only]
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On 's and 's admitting a semiregular automorphism group of order 9.
Akiyama, Kenzi, Ogawa, Masayuki, Suetake, Chihiro (2009)
The Electronic Journal of Combinatorics [electronic only]
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Latent roots and off-diagonal elements of the association matrix in PBIB designs and the number of associate classes
H. Brzeskwiniewicz (1991)
Applicationes Mathematicae
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Connectedness of row and column designs
Bronisław Ceranka, Maria Kozłowska (1991)
Applicationes Mathematicae
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Applying balanced generalized weighing matrices to construct block designs.
Ionin, Yury J. (2001)
The Electronic Journal of Combinatorics [electronic only]
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Preconditioning of two-by-two block matrix systems with square matrix blocks, with applications
Owe Axelsson (2017)
Applications of Mathematics
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Two-by-two block matrices of special form with square matrix blocks arise in important applications, such as in optimal control of partial differential equations and in high order time integration methods. Two solution methods involving very efficient preconditioned matrices, one based on a Schur complement reduction of the given system and one based on a transformation matrix with a perturbation of one of the given matrix blocks are presented. The first method involves an additional...
A generalization of the diagonal theorem on a block-matrix
E. Pap (1974)
Matematički Vesnik
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New Symmetric (61,16,4) Designs Invariant Under the Dihedral Group of Order 10
Landjev, Ivan, Topalova, Svetlana (1998)
Serdica Mathematical Journal
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∗ This work has been partially supported by the Bulgarian NSF under Contract No. I-506/1995. In this note we construct five new symmetric 2-(61,16,4) designs invariant under the dihedral group of order 10. As a by-product we obtain 25 new residual 2-(45,12,4) designs. The automorphism groups of all new designs are computed.
Efficiency of cropping system designs via base contrast
U. Bronowicka-Mielniczuk, J. Mielniczuk, T. Przybysz (2000)
Applicationes Mathematicae
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The present article is a continuation of previous papers by the same authors devoted to the efficiency of crop rotation experiments. We focus on plans distinguished by the cyclical pattern of the incidence matrix. For practical reasons, we slightly modify the efficiency coefficient. The relation between the resulting efficiency coefficients is examined. In addition, we provide a background material on crop rotation experiments.
Optimal chemical balance weighing designs for objects
Bronisław Ceranka, Małgorzata Graczyk (2003)
Kybernetika
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The paper studies the estimation problem of individual weights of objects using a chemical balance weighing design under the restriction on the number times in which each object is weighed. Conditions under which the existence of an optimum chemical balance weighing design for objects implies the existence of an optimum chemical balance weighing design for objects are given. The existence of an optimum chemical balance weighing design for objects implies the existence of an optimum...