Ralf Hemmecke <[EMAIL PROTECTED]> writes:
> Not at all. I don't understand that code. The documentation is non-existing
> for betak.
Yes. It is only in BLL. typpot(sigma, d) was certainly supposed to compute the
cycletype of sigma^d. ("Typ Potenz")
aut$CYC t * coeff$(ZIR RN) (z, t)
extracts the coefficient of x^t from z and multiplies with aut t. I don't see a
problem there.
> And second. If possible, I don't want to use a summation over all
> permutations.
Possibly, you only need to sum over all possible cycletypes. Did you have a
look at the exercise?
> Isn't there a better formula for functorial composition of CIS in some other
> book than BLL?
maybe the following is interesting
arxiv.org/pdf/math.CO/9811127
(it may be that it contains a more general construction)
I can also have look into
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6V00-45FKVGN-9N&_user=464575&_coverDate=04%2F02%2F1992&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000022258&_version=1&_urlVersion=0&_userid=464575&md5=3557d703f6608236e39bcff22a96e759
but we don't have the online version...
Martin
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