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SAJW
  • Member for 7 years, 11 months
  • Last seen more than 1 year ago
  • Neuss, Germany
9 votes
1 answer
39k views

Negation of "and" statements: a and b

5 votes
0 answers
144 views

Is there a concept of |x|<0? [closed]

5 votes
4 answers
221 views

What is the point of a $1\times 1$ matrix?

4 votes
2 answers
857 views

$\sum\limits_{k=1}^{n-1}\frac{1}{\sqrt{k(n-k)}}\geq 1$ proof

4 votes
1 answer
782 views

Is this excercise doable without a computer? Triangular Number with n divisors

3 votes
1 answer
57 views

Do these areas have any special meaning or name?

3 votes
0 answers
109 views

Calculating the optimal fireballdamage with limited skillpoints to allocate in a Game (Diablo 2)

3 votes
5 answers
208 views

Finding $B,C$ such that $B\left[\begin{smallmatrix}1&2\\4&8\end{smallmatrix}\right]C=\left[\begin{smallmatrix}1&0\\0&0\end{smallmatrix}\right]$

3 votes
4 answers
848 views

Cauchy product of $\sum\limits_n^{\infty}\frac{1}{n}$ with itself [closed]

3 votes
1 answer
703 views

Showing equivalence $(A \Rightarrow (B\Rightarrow C))\Leftrightarrow (A\wedge B) \Rightarrow C)$

3 votes
2 answers
187 views

$\sqrt{m}+\sqrt{n}\notin\mathbb{Q}$ Irrationals, Roots Proof [duplicate]

2 votes
2 answers
719 views

Understanding relation of $\sin,\cos,\tan$ with $e$

2 votes
1 answer
76 views

Is there a name for the operation that turns "$7$" and "$8$" into "$78$"?

2 votes
1 answer
123 views

$f:\mathbb{R}^{+}_0\to\mathbb{R}^{+}_0, x\mapsto\sqrt[n]{x}$ is continuous proof

2 votes
1 answer
69 views

How to prove via induction recursive sequence

2 votes
1 answer
61 views

Sums , products, binomialcoefficient Induction

2 votes
2 answers
114 views

Induction Sum of all odd Numbers

2 votes
2 answers
1k views

Showing that g exists, so that ker(g)=Im(f) and ker(f)=Im(g)

2 votes
3 answers
73 views

Uniform continuousness: are only the "extremes" interessant? (poles and infinity)

2 votes
0 answers
55 views

Is there a name for the kind of perimeter you get if you tighten a rope around an object?

1 vote
1 answer
778 views

Bijective Function between square and circle

1 vote
3 answers
79 views

Calculating distance

1 vote
0 answers
62 views

How are primenumbers called that are written by two primenumbers like 53=5 and 3

1 vote
1 answer
42 views

Proof: $x_{1-n}$ linear dependant, w alternating multilinearform $\Rightarrow$ $w(x_1,...,x_n)=0$

1 vote
2 answers
89 views

Injective function for $F^n\rightarrow F^m$

1 vote
0 answers
40 views

Set of primetwins below 30

1 vote
1 answer
2k views

Powertower with $\sqrt{2}$

1 vote
2 answers
19 views

Calculating the integral of a circlish curve

1 vote
1 answer
3k views

Propositional logic: subjective statements

1 vote
2 answers
346 views

Absolute convergence of $\sum_{n=0}^{\infty}a_n\implies\sum_{n=0}^{\infty}a_n^2$ is absolute convergent too