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Mathematics
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User124356
  • Member for 6 years, 5 months
  • Last seen more than 1 year ago
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146
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6
Show that an element of $GL_2(\mathbb{Z})$ has order $1,2,3,4,6$ or $\infty$.
Jul 17, 2020
6
Determine the number of homomorphisms from $S_{3} \rightarrow \Bbb Z_{2} \times \Bbb Z_{4}$.
May 17, 2020
5
Show that the law of $P(X_n=0)=\frac{1}{n^\alpha}=1-P(X_n=1)$ converges weakly?
Jan 23, 2022
5
How do I prove that $(X,d)$ is compact.
Jul 7, 2020
4
How to show that $\sup_n E(X_n^2) < \infty$ for a certain martingale?
Mar 2, 2022
4
Determine the degree of the field extension $\mathbb{Q}(\sqrt{2}+(5)^{1/3})$ over $\mathbb{Q}$.
Jul 18, 2020
4
Prove that $a$ commutes with each of its conjugates in $G$ if and only if $a$ belongs to an abelian normal subgroup of $G$.
Jul 18, 2020
4
Prove that $Y$ is complete iff it is closed.
May 22, 2020
3
Show that $(x,y)$ is prime and maximal ideal in $\mathbb Q[x,y]$.
Nov 29, 2019
3
How to show that $E[\phi(X,Y)|G]=E[\phi(x,Y)]$ for all $x$?
Feb 6, 2022