FUNCTION: rank_ - computes the rank of any K0X -class of type quiver
CALLING SEQUENCE:
rank_(f)
f - an arbitrary class of type quiver
SYNOPSIS:
EXAMPLES:
> with(tubular):
>
read_in(3,3,3);
> f := get_class([-7/3,3,0,2]); show(f);
>
rank_(f);
SEE ALSO: degree_, slope_, get_class, tubular/datatypes
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