This site is supported by donations to The OEIS Foundation.

Talk:Set compositions

From OeisWiki
Jump to: navigation, search

Comment on: Number of set compositions over set N2

This formula has a problem: it is valid only for k = m..2m. (Otherwise a factorial of a negative integer appears). And this should be indicated! Therefore it is more advantageous to write

Similar remarks apply to the other formulas. I will change only the case n = 2 and leave the other cases to the original author. — Peter Luschny 15:08, 25 April 2011 (UTC)

Thanks for your coments, in my original paper (still unpublished) is done the formula you mentioned.I plane to ad here. However these formulas are equivalent — Adi Dani 15:45, 25 April 2011 (UTC)

No contradictions

dear Peter you wrote However, since (: we have discovered a contradiction!)

Based on symmetric of binomial coeficients

we get that

--Adi Dani 14:42, 26 April 2011 (UTC)

I wrote nonsense! I apologize. Peter Luschny 15:10, 26 April 2011 (UTC)

Accepted, you are great man. I hope that in future we can collaborate.--Adi Dani 15:25, 26 April 2011 (UTC)