problem with recursive functions (erratum)

Hi Stavros,

Thanks for your help, that is what I was looking for. I did not know that the
f(d,x) syntax would work with recursive definitions. I found the maxima
documentation a bit tricky.
In my case however the f[d] form with 'subst' is better. I have to work with
high dimensional matrices, it is a big gain to have it calculated only once.

Thanks a lot,
Norbert