By C. J. Colbourn

The scope of the quantity contains all algorithmic and computational features of study on combinatorial designs. Algorithmic facets comprise iteration, isomorphism and research innovations - either heuristic equipment utilized in perform, and the computational complexity of those operations. The scope inside of layout idea comprises all elements of block designs, Latin squares and their versions, pairwise balanced designs and projective planes and comparable geometries.

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Cohen - - 45 + q" + q'8 + q'6 -1 qJ E7,7 576 cosets 10 double cosets Sizes: 0: 0 111 1: (7) 1 2: (745347) 6: (745634523474563452347) + + + + q25 + g2' + q2' q2' q22 q23 q2' [7] 7: (7456345234745634512347) 8: (74534762345123473456234512347) Some parameters of Lie geometries 31 9: (745347623451 234734562345123473456234512347) I11 q42 Neighbours of a point in 0: 1: I351 Q +J2 + i q 3 + 3q' +Q +Q + 4q5 + 4q6 + 5q7 + 4q8 + 4qo + 3q'O Neigbbours of a point in 1: 0: 11) 1 1: 1121 -1 q q2 ~3 3q4 + 2q6 + q7 2: [18] q5 2g6 4q7 49' 4qo 2q'O + q" 3: [4] q'0 q" + q'2 + q'J Neighbours of a point in 2: 1: IS] l + q +Zq2+q3+q' 2: 1121 -1 q2 q 3 zq4 dq5 + 3q6 + sq7+ q8 3: 1121 q6 2 2 aq8 3qo 2 p + q l l 4: 11) qQ 5: [4] $0 + q" + q ' 2 + q'3 Neighbours of a point in 3: 1: 111 1 + + + + + + + + + + + - -+ + + 2: 191 3: 1121 5: 191 6: 111 + + + + + zq2 + 3q3 + 2q4 + q5 -1 - q2 - q3 + q' + 3q5 + 4q6 + 4q7 + 2q8 + qQ q7 + 2q8 + 3qQ+ 2q'O + q" q 9'' 7: I31 q" + q'2 + q ' 3 Neigbbours of a point in 4: 2: I151 1 + q 2q2 + + + 3q4+ 2q5 + z q 6 -+ q7 + q* -1 - q2 - q 4 + 45 + q' + qQ Q' + q5 + 2q6 + 3q' + 3q8 + 3qQ+ 3q'O + 2q" + q'2 + q'3 4: 10) 5 : IZOl NeighLours of a point in 5: 2: 131 3: pi 4: 111 5: 1121 7: 191 8: 111 +q + + 2q3 + aq4+ 2q5 + -1 - q2 - q3 + 2q5 + 3q6 + sq7 + sq8+ 2qo q8 + 2qQ+ 3q'O + 2q" + q'2 1 q2 q3 q'3 (12 g6 + 2q" 32 A.

2 also gives a subexponential time algorithm for finding the largest subdesign; in practice, the subexponential method operates quite quickly, since its worst case is realized only when there is a significant number of subdesigns (such as the projective and affme spaces). In many of the worst cases, the design has a subdesign of maximal order, a head. Although we are unable to determine the size of the maximal subdesign in polynomial time, we can make one step in this direction, by determining whether the design has a head.

To describe these properties we need to consider the data structures used to represent subsets. ,n . A k-subset S of an n-set can be represented as a 6itwctor (61, 62, ... ,6,), where 6, is 1 if z is in S and 0 if z is not in S. Alternatively, if S={aI, 82, ... ,ak} where 81 < 82 < ... >8 k ) - (Aside : AU the algorithms above can be implemented using either data structure. For testing each algorithm was implemented using the data structure which made it faster: bitvectors were used for BER and EE, all the others used ordered arrays.