FUNCTION: uf_dynkin - determine the (ext.) Dynkin diagram corresponding to a unit form

CALLING SEQUENCE:
uf_dynkin(q)

PARAMETERS:
q - matrix of the unit form

SYNOPSIS:

• uf_dynkin finds the Dynkin or extended Dynkin diagram corresponding to a unit form, by means of Gabrielov transformations.

• The function works only with unit forms which are positive or nonnegative defined.

EXAMPLES:

> q:=uf_init([4,[1,2],[2,3],[3,4],[4,1]]);

> uf_dynkin(q);

> q:=uf_init([6,[1,2],[2,3],[3,4],[4,5],[5,6],[6,1],[1,3,1],[2,4,1]]);

> uf_dynkin(q);