esrd_rootss.html

FUNCTION: esrd_rootss - sincere positive roots of the Tits-form

CALLING SEQUENCE:
esrd_rootss(o,n)
esrd_rootss(o,n,smin)
esrd_rootss(o,n,smin,smax)

PARAMETERS:
o - the orbit type of an exceptional sincere representation directed algebra
n - a positive integer less than or equal to esrd_num(o)
smin,smax - optional parameters evaluating to a name

SYNOPSIS:

esrd_rootss(o,n) returns for the class n of exceptional sincere representation directed algebras belonging to orbit type o a list of all sincere positive roots of the corresponding Tits-form.

Via the optional third parameter smin the unique minimal sincere positive root of the Tits-form may be obtained.

Via the optional forth parameter smax a list of all maximal positive roots may be obtained.

See esrd_orbittypes for valid values of o.

EXAMPLES:

> esrd_rootss(221,3);

SEE ALSO: esrd_rootsa

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