Combinatorial Mathematics IV

Comma-free codes and incidence algebras....Pages 1-6
Non-orthogonal graeco-latin designs....Pages 7-26
An infinite family of skew weighing matrices....Pages 27-40
Some elementary aspects of the catalan numbers....Pages 41-45
Some new constructions for orthogonal designs....Pages 46-54
Bounds of finite relations....Pages 55-60
Products of graphs and their spectra....Pages 61-72
Some computational results on the spectra of graphs....Pages 73-92
A non-imbeddable proper colouring....Pages 93-115
Minimal degree of primitive permutation groups....Pages 116-122
Number of factors in K-cycle decompositions of permutations....Pages 123-131
Some incidence structures of maximal rank....Pages 132-135
A theorem on planar graphs....Pages 136-141
The number and stability indices of C n -trees....Pages 142-148
On crystallographic colour groups....Pages 149-157
Designs from cyclotomy....Pages 158-176
Bordered symmetric square roots of the identity matrix....Pages 177-184
Integer sequences with given sum and restricted differences....Pages 185-192
Orthogonal designs in order sixteen....Pages 193-197
Counting arrangements of bishops....Pages 198-214
The principle of random union of gametes in a finite population....Pages 215-219
The stability index of the product of a path and a tree....Pages 220-231
Computation of g (1,3;12)....Pages 232-239
Embedding proper colourings....Pages 240-245
Some large subsquares....Pages 246-249