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May
10
asked Looking for a “job description” for Hölder's inequality
May
4
awarded  Popular Question
Mar
11
awarded  Necromancer
Feb
9
awarded  Popular Question
Jan
16
awarded  Nice Question
Jan
6
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Jan
3
accepted When is a pullback also a pushout?
Dec
22
awarded  Nice Question
Nov
27
awarded  Nice Question
Oct
11
asked Is there a name for products $\Delta(v)\!\cdot\!M$ and $M\!\cdot\!\Delta(w)$?
Sep
30
awarded  Explainer
Sep
29
asked Looking for name of function for the indexing of one ordering relative to another
Sep
12
comment Gaussian proof for the sum of squares?
Spectacular! Thanks for posting it.
Aug
21
awarded  Popular Question
Aug
17
comment What's the name of $\sum_{k = 0}^{n} (-1)^k {n \choose k} (n-k)^w$?
@PedroTamaroff: thanks! Your comment pointed me in the right direction. According the the Wikipedia page on the I-E principle, the expression I found equals $n! \, S(w, n)$, where $S(w, n)$ is a "Stirling number of the second kind"...
Aug
17
asked What's the name of $\sum_{k = 0}^{n} (-1)^k {n \choose k} (n-k)^w$?
Jul
23
awarded  Yearling
Jul
2
awarded  Curious
Jul
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awarded  Inquisitive
May
17
awarded  Nice Question