co.combinatorics - Sum of combinations - MathOverflow
If you are interested in approximations to your ratios, you may find the accepted answer (and some comments of mine) to this MathOverflow post useful: Sum of 'the first k' binomial …
Combinations of multisets with finite multiplicities
In addition to the OP's 2011 paper with Ž. Jurić: A New Formula for the Number of Combinations of Permutations of Multisets Applied Mathematical Sciences, Vol. 5, 2011, no. 18, 875-881 …
Important formulas in combinatorics - MathOverflow
Aug 17, 2015 · Zaslavsky's formula is a very important formula in enumerative combinatorics, as well as geometric combinatorics, and the basis for important developments in topological …
Combination formula of $ (-1)^ {n-1}2 (n-1)!$ - MathOverflow
Feb 17, 2025 · How to prove that $$\\sum_{b=0}^{[\\frac{n}{2}]}(-1)^{n-b-1}(n-b-1)!\\binom{n}{n-2b}\\frac{\\binom{2b}{2}\\binom{2b-2}{2}\\dots \\binom{2}{2}}{b!}2^{n-b}$$ equals ...
Combination with repetition with limit - MathOverflow
First component (for i = 0) is just a regular combination with repetition, then I subtract all that have at least 1 box overfilled, then I need to add those that have at least 2 box overfilled (since …
Sum of 'the first $k$' binomial coefficients for fixed $N$
One can take this a step further. In addition to combining pairs of terms of the original sum N choose i to get a sum of terms of the form N+1 choose 2j+c, where c is always 0 or always 1, …
Creating a combinations with unique sets - MathOverflow
0 I have been struggling with this problem and hope someone could help. I am trying a variation of non-repetitive combination scenario. I can use the formula n!/r!x (n-r)! to find non-repetitive …
asymptotic or approximate formula for a combination expression
asymptotic or approximate formula for a combination expression Ask Question Asked 12 years, 10 months ago Modified 12 years, 10 months ago
Combinatorial\Probabilistic Proof of Stirling's Approximation
The Wikipedia page List of probabilistic proofs of non-probabilistic theorems has a reference to the paper: Blyth, Colin R.; Pathak, Pramod K. A Note on Easy Proofs of Stirling's Theorem. …
Source of a formula for tensor product multiplicities?
May 10, 2013 · This is a follow-up to a recent question by Allen Knutson here, involving a special type of tensor product multiplicity for a simple Lie algebra $\\mathfrak{g}$ over $\\mathbb{C}$ …