HaskellForMaths-0.4.8: Combinatorics, group theory, commutative algebra, non-commutative algebra

Math.Combinatorics.StronglyRegularGraph

Description

A module defining various strongly regular graphs, including the Clebsch, Hoffman-Singleton, Higman-Sims, and McLaughlin graphs.

A strongly regular graph with parameters (n,k,lambda,mu) is a (simple) graph with n vertices, in which the number of common neighbours of x and y is k, lambda or mu according as whether x and y are equal, adjacent, or non-adjacent. (In particular, it is a k-regular graph.)

Strongly regular graphs are highly symmetric, and have large automorphism groups.

# Documentation

isSRG :: Ord a => Graph a -> Bool Source

t' :: (Ord a, Ord t, Num a, Num t, Enum a, Enum t) => a -> Graph t Source

t :: (Ord a, Num a, Enum a) => a -> Graph [a] Source

l2' :: (Ord a, Ord t, Num a, Num t, Enum a, Enum t) => a -> Graph t Source

l2 :: (Ord a, Num a, Enum a) => a -> Graph (a, a) Source

paleyGraph :: (Ord t, Num t) => [t] -> Graph t Source

(+^) :: Ord a => [[a]] -> Permutation a -> [[a]] Source

(+^^) :: Ord a => [[a]] -> [Permutation a] -> [[[a]]] Source

Constructors

 C P Integer B [Integer]

Instances

 Eq DesignVertex Ord DesignVertex Show DesignVertex

sp :: Int -> Graph [F2] Source

switch :: Ord t => Graph t -> [t] -> Graph t Source