Dear GAP-Forum, I am pleased to announce the release of version 1.4 of the DESIGN package for GAP. The DESIGN package is for constructing, classifying, partitioning and studying block designs.
DESIGN 1.4 is available from both http://designtheory.org/software/gap_design/ and http://www.gap-system.org/Packages/design.html . If you have not already done so, I strongly recommend that you upgrade GAP to version 4.4.12 and GRAPE to version 4.3, before installing DESIGN 1.4. The main changes from DESIGN 1.3 to DESIGN 1.4 are: - Improved and documented the main features of function SemiLatinSquareDuals, which can be used to classify (n x n)/k semi-Latin squares and SOMA(k,n)s with given properties and small n. - Added the function AGPointFlatBlockDesign, and improved the efficiency of function PGPointFlatBlockDesign. - Made function TDesignLambdas faster, in particular in the case of a point-transitive design, when that design's record includes a known point-transitive subgroup of the design's automorphism group. - Improved the (undocumented) function IsPossiblySBIBD so that TDesignBlockMultiplicityBound now makes full use of the Bruck-Ryser-Chowla Theorem. - Improved the speed of functions TDesignBlockMultiplicityBound and ResolvableTDesignBlockMultiplicityBound when the bounds are large. Regards, Leonard Soicher _______________________________________________ Forum mailing list Forum@mail.gap-system.org http://mail.gap-system.org/mailman/listinfo/forum
