Dear All, I am pleased to announce the release of version 1.3 of the DESIGN package for GAP. This release fixes two small bugs in the Design 1.2 major upgrade (see below), and includes a new function `WittDesign' for constructing the famous designs of Witt related to the Mathieu groups.
DESIGN 1.3 is available from both http://designtheory.org/software/gap_design/ and http://www.gap-system.org/Packages/design.html . Best wishes, Leonard %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Main changes from DESIGN 1.2 to DESIGN 1.3 ------------------------------------------ (1) Added function: WittDesign. (2) Fixed a bug which caused a break loop to be entered in certain cases in function BlockDesigns when the least element of blockSizes was equal to tSubsetStructure.t. (3) Fixed a rarely occurring bug which caused no designs to be returned in function BlockDesigns in certain cases when the designs had just one block each. (4) Small improvements made to the documentation and the code. Main changes from DESIGN 1.1 to DESIGN 1.2 ------------------------------------------ (1) Added functions: BlockIntersectionPolynomial BlockIntersectionPolynomialCheck TDesignLambdas TDesignLambdaMin TDesignIntersectionTriangle SteinerSystemIntersectionTriangle TDesignBlockMultiplicityBound ResolvableTDesignBlockMultiplicityBound BlockDesignPoints NrBlockDesignPoints BlockDesignBlocks NrBlockDesignBlocks PairwiseBalancedLambda AffineResolvableMu DeletedPointsBlockDesign DeletedBlocksBlockDesign AddedPointBlockDesign AddedBlocksBlockDesign DerivedBlockDesign ResidualBlockDesign (2) The function BlockDesign can now (optionally) construct a block design from base blocks and a group of automorphisms, and the list of blocks given to BlockDesign need no longer be sorted. (3) Improved documentation of the function TDesignFromTBD, and changed the parameters (in a backward compatible way) to match the description of the "*-construction" in the McSorley-Soicher paper. (4) The (undocumented) resolveSimple option removed from functions BlockDesigns and PartitionsIntoBlockDesigns, and the option b added to these functions (to specify the number of blocks in a required block design or partition part). (5) Improvements made to the use of store (and time?) by the function BlockDesigns. _______________________________________________ Forum mailing list [email protected] http://mail.gap-system.org/mailman/listinfo/forum
