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Hyacinth
  • Member for 6 years, 9 months
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3
What's the flaw of my argument when dimension is infinite?
Jan 16, 2020
2
Let ${x_n}=2^{n}a_n$, and $a_{n+1}=\sqrt{\frac{1-\sqrt{1-a_n^2}}{2}}, a_0=1$, how to prove ${x_n}$ converges?
Nov 8, 2018
2
Simplify the following expression $\sum_{j=0}^n 2^n \binom{1/2}{n-j}\binom{j-1/2}{j}$
Sep 25, 2019
2
Find a corresponding subrepresentation of a irreducible representation in a representation.
Sep 30, 2019
2
Determine the following set is open or closed in $\mathbb{A}^2$
Jan 13, 2020
2
Serre's local field, Chapter 1 Proposition 10.
Apr 30, 2020
2
Need help with an operation on finite length $A$-modules and Grothendieck Group
May 1, 2020
1
How to show regular representation of $G$ is isomorphic to the permutation representation by conjugation if and only if conjugation is transitive?
Sep 8, 2019
1
Let $(X,d)$ be metric space, let $A$ be open, then $\partial(A\cup A')\subseteq A'$.
Sep 15, 2019
1
Suppose $\sum_{n=1}^{\infty}a_nx^n=f(x)$, then what can we say $\sum_{n=1}^{\infty}\frac{a_n}{n^3}x^n$ and the limit?
Oct 4, 2019