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abstract-algebra

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Votes Activity Newest Views Added
0
votes
1
answer
46
views

Show that a.s. $\limsup_n \frac{X_n}{\sqrt{2\log n}} \le 1$

real-analysis probability probability-theory analysis
Oct 25 at 20:53 Dominik Kutek 5,156
1
vote
1
answer
30
views

How to verify that an $\mathbb F[G]$-module has an imprimitivity decomposition or not?

abstract-algebra group-theory finite-groups representation-theory
Oct 21 at 8:43 Derek Holt 68.5k
0
votes
1
answer
29
views

Trivial representation from the Young symmetrizer

group-theory representation-theory
Oct 19 at 3:41 Victor Gustavo May 1,128
1
vote
0
answers
25
views

A question about $G$-modules, representations, and $F[G]$-modules

representation-theory
Aug 23 at 20:46 DEATH_CUBE_K 585
0
votes
1
answer
66
views

Probability of convergence of random variables

probability random-variables independence borel-cantelli-lemmas
Jul 9 at 1:54 Robert Israel 397k
3
votes
3
answers
166
views

Let $\{X_n\}$ be i.i.d $N(0,1)$ random variables. Show that $\limsup_{n\rightarrow\infty} \frac{|X_n|}{\sqrt{\log n}}=\sqrt2$ a.s.

probability probability-theory self-learning probability-limit-theorems
Jun 10 at 18:32 Sangchul Lee 126k
1
vote
1
answer
101
views

For non-negative definite symmetric matrices, $\mathrm{tr}(AB)\le \mathrm{tr}(A)\mathrm{tr}(B)$ [duplicate]

matrices trace positive-semidefinite transpose matrix-norms
May 27 at 14:31 MaoWao 7,134
3
votes
0
answers
45
views

Orthogonal derivative implies second derivative is null

real-analysis multivariable-calculus derivatives linear-transformations frechet-derivative
Feb 23 '20 at 13:16 MathNewbie 913
0
votes
0
answers
39
views

Does $\lim_{n} \langle x^{*},f_n(t)\rangle =\langle x^{*},f(t) \rangle$ for all $x^*\in X^*$ and a.e. $t$ imply $\lim_nf_n (t) = f (t)$ for a.e. $t$?

functional-analysis measure-theory
Feb 21 '20 at 16:40 Community♦ 1
6
votes
2
answers
188
views

What is the intuition behind the law of quadratic reciprocity?

number-theory
Mar 3 at 20:19 Community♦ 1
2
votes
1
answer
90
views

problem 6.7 in Character theory of finite groups

group-theory finite-groups representation-theory characters
Feb 1 '20 at 8:27 Vegetable 71
2
votes
2
answers
88
views

Show that $\forall f\in C(X)\ \ f(x_n) \to f(x)\implies x_n \to x$.

analysis continuity weak-convergence
Jan 17 '20 at 21:08 TheHolyJoker 1,937
3
votes
1
answer
142
views

$\mbox{tr}((AB)^2) = \mbox{tr} (A^2B^2)$

linear-algebra matrices trace
Jan 12 '20 at 16:31 Community♦ 1
9
votes
4
answers
855
views

Prove that $\det(AB - BA) = \frac{1}{3}\left(\mathrm{Trace}(AB - BA)^3\right)$

linear-algebra matrices determinant
Jan 14 '20 at 5:28 pre-kidney 27k
2
votes
1
answer
146
views

Why these are isomorphic each other for given these rings?

abstract-algebra ring-theory ideals
Jan 12 '20 at 23:04 Bill Dubuque 244k
7
votes
3
answers
336
views

Show $\mathbb Z[x]/(x^2-cx) \ncong \mathbb Z \times \mathbb Z$.

abstract-algebra ring-theory ideals polynomial-rings
Nov 12 at 10:49 Bill Dubuque 244k
4
votes
1
answer
153
views

Proving that a group of order $p^nq$ for primes $p$ & $q$ is not simple.

abstract-algebra group-theory sylow-theory simple-groups
Jan 10 '20 at 21:11 Bliipbluup 482
0
votes
1
answer
46
views

Fraction Field and isomorphism of R-modules

abstract-algebra
Jan 2 '20 at 2:22 jgon 25.6k
3
votes
2
answers
78
views

Show that for every $g \in G$, $g$ lies in the subgroup generated by $P$ and $g^{−1}Pg$.

abstract-algebra group-theory sylow-theory
Dec 30 '19 at 9:15 Nicky Hekster 37.4k
4
votes
1
answer
293
views

Lower Semicontinuous Function = Supremum of Sequence of Continuous Functions

real-analysis metric-spaces semicontinuous-functions
Dec 29 '19 at 0:31 Community♦ 1
0
votes
1
answer
31
views

Let $S\subseteq\Bbb N $ and $X,Y\sim\text{Uniform}([0,1])$. What is $\text{Pr}(\lfloor X/Y\rfloor\in S)$?

probability sequences-and-series
Nov 24 '19 at 20:34 Vincent 7,307
1
vote
1
answer
175
views

Lebesgue measure is ergodic on a circle with irrational rotation.

ergodic-theory
Nov 19 '19 at 2:17 mathworker21 29.2k
4
votes
3
answers
76
views

Normal subgroup fixes every element of a set.

group-theory group-actions normal-subgroups
Nov 15 '19 at 0:09 Community♦ 1
0
votes
1
answer
69
views

Prove this exercise from K.L. Chung using just Borel Cantelli Lemma

probability probability-theory measure-theory borel-cantelli-lemmas
Nov 10 '19 at 7:17 Lord KK 1,115
0
votes
0
answers
50
views

Show that if $\lim_{n\rightarrow\infty}\int_E|f_n|=\int_E|f|$ then $\int_E|f-f_n|\rightarrow 0$. [duplicate]

real-analysis analysis
Nov 6 '19 at 0:52 Sangchul Lee 126k
2
votes
1
answer
355
views

Change of Measure under Radon Nikodym Derivatives

probability-theory measure-theory radon-nikodym
Nov 1 '19 at 7:41 Xiaohai Zhang 1,794
1
vote
2
answers
129
views

How to prove that conditional independence does not imply independence?

probability probability-theory conditional-probability
Sep 29 '19 at 4:57 drhab 133k
5
votes
3
answers
154
views

Exercise 6.11 from Isaac's Character theory of finite groups.

group-theory finite-groups characters
Nov 13 '19 at 13:57 Beginner 9,500
2
votes
1
answer
45
views

How many binary strings of length $n$ contain $k$ flips?

combinatorics
Sep 22 '19 at 18:40 Bach 4,745
2
votes
1
answer
154
views

Understanding the difference between the multinomial coefficients and the Stirling number of the 2nd kind

combinatorics
Sep 13 '19 at 0:22 Donald Splutterwit 34k
1
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