Zobrazeno 1 - 10
of 165
pro vyhledávání: '"Biggs, Norman"'
Autor:
Biggs, Norman
Publikováno v:
Archive for History of Exact Sciences, 2019 Jul 01. 73(4), 361-383.
Externí odkaz:
https://www.jstor.org/stable/45211982
Autor:
Biggs, Norman
An approach to the enumeration of feasible parameters for strongly regular graphs is described, based on the pair of structural parameters (a,c) and the positive eigenvalue e. The Krein bound ensures that there are only finitely many possibilities fo
Externí odkaz:
http://arxiv.org/abs/1106.0889
Autor:
Biggs, Norman
This is a report on a failed attempt to construct new graphs that are strongly regular with no triangles. The approach is based on the assumption that the second subconstituent has an equitable partition with four parts. For infinitely many odd prime
Externí odkaz:
http://arxiv.org/abs/1003.0175
Autor:
Biggs, Norman
The feasibility conditions obtained in a previous report are refined, and used to determine several infinite families of feasible parameters for strongly regular graphs with no triangles. The methods are also used to improve the lower bound for the n
Externí odkaz:
http://arxiv.org/abs/0911.2455
Autor:
Biggs, Norman
A simplified version of the theory of strongly regular graphs is developed for the case in which the graphs have no triangles. This leads to (i) direct proofs of the Krein conditions, and (ii) the characterization of strongly regular graphs with no t
Externí odkaz:
http://arxiv.org/abs/0911.2160