The number of blocks with a given defect group
β Scribed by Geoffrey R Robinson
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 562 KB
- Volume
- 84
- Category
- Article
- ISSN
- 0021-8693
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## Abstract G. Ringel conjectured that for every positive integer __n__ other than 2, 4, 5, 8, 9, and 16, there exists a nonseparable graph with __n__ cycles. It is proved here that the conjecture is true even with the restriction to planar and hamiltonian graphs.
It is well known that it is possible to construct ($-q)/2 (miquelian) inversive planes of order q on the same set of points which pairwise intersect in precisely the circles through infinity. Here we give an explicit description of such a family by "projecting" certain Buekenhout-Metz unitals in a w