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For fiber-commutative coherent configurations, we show that Krein parameters can be defined essentially uniquely. As a consequence, the general Krein condition reduces to positive semidefiniteness of finitely many matrices determined… Click to show full abstract
For fiber-commutative coherent configurations, we show that Krein parameters can be defined essentially uniquely. As a consequence, the general Krein condition reduces to positive semidefiniteness of finitely many matrices determined by the parameters of a coherent configuration. We mention its implications in the coherent configuration defined by a generalized quadrangle. We also simplify the absolute bound using the matrices of Krein parameters.
Keywords:
coherent configurations;
fiber commutative;
commutative coherent;
krein parameters;
parameters fiber
Journal Title: Algebra Colloquium
Year Published: 2020
Link to full text (if available)
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Journal Title: Algebra Colloquium
Year Published: 2020
Link to full text (if available)
Share on Social Media: Sign Up to like & get
recommendations!