FUNCTION: heralg[one_pt_coxpoly] - the Coxeter polynomial of a one-point extension of a quiver algebra

CALLING SEQUENCE:
one_pt_coxpoly(Q,x)

PARAMETERS:
Q - a quiver given by a quiverdata structure
x - a vector

SYNOPSIS:

EXAMPLES:

> with(heralg):

> one_pt_coxpoly( [2,[[1,2,r]]], array([1,1]) );

[Maple Math]

> Q := [ 3, [[1,2], [2,3,2]]];

[Maple Math]

> x := array( [0,2,1] );

[Maple Math]

> one_pt_coxpoly(Q,x);

[Maple Math]

SEE ALSO: heralg/quiverdata, heralg[coxeter_polynomial]

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