DESCRIPTION:
Usually, the user of CREP will not get into direct contact with the internal data format used for communication between the function get_alg on the Maple-surface of crep and its external programm.
However, via the files crep.com and crep.src this format is easily accessible.
The format is as follows:
- [0] for the empty quiver
- [n,clist] for a quiver with n vertices, where clist is a list of coordinates of the vertices.
- [n,clist,alist] for a quiver with n vertices with the coordinates given in clist and arrows given in alist.
- [n,clist,alist,rlist] for a quiver with n vertices with the coordinates in clist, arrows given in alist and relations in rlist.
It is
- clist = [[x coordinate of vertex 1, y coordinate of vertex 1], ..., [x coordinate of vertex n, y coordinate of vertex n]]
- alist = [arrow, ..., arrow]
- arrow = [start vertex, end vertex, number, [x coordinate of the middle of the arrow, y coordinate of the middle of the arrow]]
- rlist = [relation, ..., relation]
- relations = [cpath, ..., cpath]
- cpath = [coeff, path]
- path = [arrownumber, ..., arrownumber]
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