Rewriting Factorial Expressions
45280
Is there an Inverse Gamma $\Gamma^{-1} (z) $ function?
59934
What is the term for a factorial type operation, but with summation instead of products?
20618
Expressing a factorial as difference of powers: $\sum_{r=0}^{n}\binom{n}{r}(-1)^r(l-r)^n=n!$?
143264
Is there a nice way of expanding multinomials of the form $(1+x+\cdots+x^l)^n$?
118024
Simplify the expression $\binom{n}{0}+\binom{n+1}{1}+\binom{n+2}{2}+\cdots +\binom{n+k}{k}$
53157
Factoring Quadratics
158114
Representing the double factorial of LaguerreL[n, 1, x]/( (n + 1) LaguerreL[n, 0, x])
126214
Multiplying Binomial Terms
56463
Factorial of a non-integer number
24262
Best and shortest way to evaluate mathematical expressions
91538
What are the rules for factorial manipulation?
45204
Combinatorial proofs: having a difficult time understanding how to write them out
110783
Simplifying complex expression with Mathematica
63211
Replacements/Substitutions in Mathematica
67985
Change variables in differential expressions
146305
Simplify sum of factorials with mathematical induction
48446
Summation involving a factorial: $1 + \sum_{j=1}^{n} j!j$