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Mathematics
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Nasal's user avatar
Nasal
  • Member for 4 years, 11 months
  • Last seen more than a month ago
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17
Number of functions $f:\{1,...,n\}\to\{1,...,n\}$ that have $|f^{-1}(\{i\})|=i$ for some $i$
Jan 15, 2020
4
Uniqueness of total derivative on non-open sets
Aug 11, 2019
4
Interesting identity $\sum_{A\subseteq X\\B\subseteq X}|A\cap B|=n4^{n-1}$
Nov 21, 2019
4
Uniqueness of total derivative on non-open sets
Aug 11, 2019
3
Number of non-isomorphic simple graphs whose degrees of all vertices is less than or equal to $2$
Jan 31, 2020
3
Group of order $15$ has element of order $5$
Nov 20, 2020
2
Well ordered set that isn't topologically complete
Jan 24, 2021
2
If $E|Y|\lt \infty$, $E[Y|X] = m(X)$ and $(X_1,Y_1)$ come from same distribution as $(X,Y)$. Is it true that $E[Y_1|X_1] = m(X_1)$?
May 24, 2023
2
Number of shortest paths on a grid from $(0,0)$ to $(m,n)$ that don't go through (odd,odd) except perhaps $(m,n)$
Nov 21, 2019
2
Locally Lipschitz at a point and around a point.
Dec 10, 2019