FUNCTION: heralg[coxeter_polynomial] - the characteristic polynomial of the Coxeter matrix of a quiver algebra
CALLING SEQUENCE:
coxeter_polynomial(Q)
Q - a quiver given by a quiverdata structure
SYNOPSIS:
EXAMPLES:
>
with(heralg):
>
coxeter_polynomial( [2,[[1,2,r]]] );
>
Q := [ 3, [[1,2], [2,3,2]]];
>
coxeter_polynomial(Q);
SEE ALSO: heralg/quiverdata, heralg[coxeter_matrix]
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