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jublikon
  • Member for 6 years, 7 months
  • Last seen more than a month ago
  • Germany
5 votes
1 answer
1k views

How to prove that a given function is not a group homomorphism?

4 votes
6 answers
6k views

How to prove $\lim\limits_{x\to 0}x^m (\ln x)^n = 0$

4 votes
3 answers
489 views

Convergence of $ \sum_{k=1}^{\infty} \frac {3^k}{5^k + 1}$

3 votes
1 answer
298 views

how to get number of possible public keys in RSA

2 votes
2 answers
413 views

order of permutation $(2,9,6,3,7)(4,8)$ in $S_9$

2 votes
3 answers
709 views

Why is $X^4-X^2+1$ reducible over $\Bbb F_5$?

2 votes
0 answers
52 views

$f_1:\left(0, \frac{\pi}{2}\right), f_1(x)=\left(\frac{\ln\left(\cos^2(x)\right)}{\ln\left(x^3\right)}\right)$

2 votes
1 answer
41 views

Does an injective $\mathbb F_9$ vector space homomorphism $\mathbb F_9^5 \to \mathbb F_9^3$ exist?

2 votes
1 answer
870 views

Find matrices $P$ and $Q$ to check if matrices $A$ and $B$ are equivalent( $ Q^{-1}AP = B$ )?

2 votes
3 answers
40 views

Probability of $12$ different dices containing at least one $5$ and at least one $4$?

2 votes
2 answers
124 views

If $f \circ g$ is surjective, then f is surjective

2 votes
1 answer
78 views

limit of: $\begin{align} \lim_{n\to \infty}\sqrt{n-2\sqrt{n}}-\sqrt{n} \end{align}$ [duplicate]

2 votes
4 answers
65 views

Check differentiability of function in $x_0 = 0$

1 vote
1 answer
176 views

Is $U:=\{A \in \mathbb{Q}^{n \times n} | AX = XA, \quad \forall X \in M \}$ sub vector space of $\mathbb{Q}^{n \times n}$?

1 vote
2 answers
74 views

check if $\sum_{k=1}^{\infty}{ \left( \frac{7k-2}{8k-3 \sqrt{k}}\right)}^k$ converges

1 vote
1 answer
118 views

Does it hold that $\kappa(A^2) = \kappa(A)^2$?

1 vote
1 answer
225 views

project point onto line using formula containing inner and outer vector products

1 vote
2 answers
58 views

If $x,y \in V$ are linearely independent, then there exists a transvection $\tau$ with $\tau(x)=y$

1 vote
3 answers
68 views

Computing the series$\sum\limits_{k=1}^{\infty}{\frac{3^{k-1}+(2i)^k}{5^k}} $

1 vote
2 answers
43 views

Prove via induction $\sum_{k=2}^{n}{\frac{k-1}{k!}} = \frac{n!-1}{n!}, \forall n \in \mathbb{N}, n \ge 2$

1 vote
2 answers
3k views

Show limit for recursive sequence by induction

1 vote
3 answers
8k views

Show convergence of recursive sequence and find limit value

1 vote
4 answers
65 views

Calculating inverse of $(7+9i)$

1 vote
3 answers
109 views

show using the $\epsilon - \delta$ criterion: $ \quad f(x)= \frac{x^2}{|x|} \quad \lim_{x\rightarrow 0} f(x) = 0$

1 vote
2 answers
286 views

Is $X^3+2X^2-3X-2$ irreducible in $\mathbb F_7[X]$?

1 vote
1 answer
33 views

Cardinality of possibilities to distribute 4 children to two pods?

1 vote
0 answers
60 views

solve $c_1, c_2, c_3$ for matrix so that it has infinite solutions and no solutions

1 vote
3 answers
2k views

How many possible passwords of a four digit length contain at least one uppercase character and at least one number?

1 vote
1 answer
27 views

How many possible casts of $9$ dice are possible with at least one $5$ or at least one $1$ or both?

1 vote
0 answers
24 views

How many possible orders can I create for differenct lecturers with multiple presentations?