xpre
- look for preprojective components
xpreh
xprep
CALLING SEQUENCE:
xpre(n)
xpre(n,r,p1,m1, ...)
xpreh(Q)
xprep(p)
PARAMETERS:
n - an integer
r - a list of integers (see below)
p1,m1, ... - dimension vectors and multiplicities (see below)
Q - a heralg/quiverdata structure
p - a bound poset algebra
DESCRIPTION:
xpre( | n,[r1,...,rn], |
p1, m1, ... ,pr1, mr1, | |
pr1+1, mr1+1,..., pr1+r2, mr1+r2 | |
... | |
pr1+...+rn-1+1, ... , mr1+...+rn). |
EXAPMPLES:
The following three function calls are equivalent:
> xpre(4,[1,2,0,0],[0,1,1,1],1,[0,0,1,0],1,[0,0,0,1],1);
> xprep([4,[[2,1],[3,2],[4,2]]]);
> xpreh([4,[[1,2],[2,3],[2,4]]]);
Also, the following two calls are equivalent:
> xprep([4,[[2,1],[3,1],[4,3,2]]]);
> xpre(4,[1,1,1,0],[0,1,1,1],1,[0,0,0,1],1,[0,0,0,1],1);
Again, two equivalent calls:
> xpreh([3,[[1,2,2],[3,2,1]]]);
> xpre(3,[1,0,1],[0,1,0],2,[0,1,0],1);
SEE ALSO: xpre/interface, heralg/quiverdata, posetalgebra
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