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Designs with mutually orthogonal resolutions. (English) Zbl 0618.05009
A combinatorial design D with replication number r is said to be resolvable if the blocks of D can be partitioned into classes $$R_ 1,R_ 2,...,R_ r$$ such that each element of D is contained in precisely one block of each class. Two resolutions R and R’ of D are called orthogonal if $$| R_ i\cap R_ j'| \leq 1$$ for all $$R_ i\in R$$, $$R_ j'\in R'$$. A set $$Q=\{R^ 1,R^ 2,...,R^ t\}$$ of t resolutions of D is called a set of mutually orthogonal resolutions (MORs) if the resolutions of Q are pairwise orthogonal. The authors construct designs with sets of t MORs for several sequences of t. Furthermore, for given designs they determine upper bounds for t.
Reviewer: H.Groh

##### MSC:
 05B05 Combinatorial aspects of block designs
##### Keywords:
resolvable design; orthogonal resolutions
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##### References:
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