FUNCTION: heralg[one_pt_cartmatrix] - the Cartan matrix of a one-point extension of a quiver algebra
CALLING SEQUENCE:
one_pt_cartmatrix(Q,x)
Q - a quiver given by a quiverdata structure
x - a vector
SYNOPSIS:
EXAMPLES:
>
with(heralg):
>
one_pt_cartmatrix( [2,[[1,2,r]]], array([1,1]) );
>
Q := [ 3, [[1,2], [2,3,2]]];
> x := array( [0,2,1] );
>
one_pt_cartmatrix(Q,x);
SEE ALSO: heralg/quiverdata, heralg[cartan_matrix]
BACK TO: start page of the crep online manual, heralg