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A Brandt module M is equipped with a family of linear Hecke operators
which act on it. These are returned as matrices, which act on the
right with respect to the basis Basis(M), but the Hecke operators
of the ambient module may also be applied to elements of submodules.
The system of Hecke operators are computed by default using the theta
series which define the classical Brandt matrices. If a module is created
with the ComputeGram parameter set to false, the Hecke operators
are determined by means of enumeration of ideals in a p-neighbouring
operation analogous to the method of graphs approach of Mestre and
Oesterlé [Mes86].
Compute a matrix representing the nth Hecke operator Tn with respect
to Basis(M) for the Brandt module M.
Computes the Atkin--Lehner operator on the Brandt module M, where p is a prime
dividing the discriminant of M.
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