David Moews

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248 Answers

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21
Does every sequence of rationals, whose sum is irrational, have a subsequence whose sum is rational
20
How can I calculate $\sin\left(10^{10^{100}} - 10\right)^\circ$?
17
Is this sequence unbounded?
16
Study the convergence of $\sum_{n=1}^{\infty}\Bigl( \sqrt[n]{1+\frac{1}{n}}-1\Bigr)$
15
Showing $\prod\limits_{i<j} \frac{x_i-x_j}{i-j}$ is an integer
12
Is it true that any matrix can be decomposed into product of rotation,reflection,shear,scaling and projection matrices?
11
Is the set $\{\sin (p_{i})| p_{i} \,\,\mbox{is a prime number, for all}\,\,i\in \mathbb{N}\}$ linearly independent?
10
About translating subsets of $\Bbb R^2.$
9
Expected rank of a random binary matrix?
9
The group of permutations with almost all points fixed is a maximal normal subgroup of the symmetric group.
8
What does the phrase “except possibly” mean?
8
When is the number 11111…1 a prime number?
7
Is every compact hypersurface contained in a sphere which it touches twice?
7
Is the asymptotic density of powers of primes zero?
6
Proof that $\mathbb{R}[x]$ is not a finite dimensional vector space
6
Cantor set on the circle
6
Closed-form expression for $\sum_{n=1}^{k} (-1)^{n+1}n^2(n^2-1)\binom{2k}{k-n}$?
6
Expected value of a log Poisson distribution
6
How to prove $\frac{1}{2}f''(\xi) = \frac{f(a)}{(a-b)(a-c)}+\frac{f(b)}{(b-a)(b-c)}+\frac{f(c)}{(c-a)(c-b)}$
6
Is a sum of equidistributed sequences $\sum \{n \alpha\}$ equidistributed?
6
Irrationality measure of the Chaitin's constant $\Omega$
5
How many positive numbers need to be added together to ensure that the sum is infinite?
5
Close linearly independent sequence
5
Closed form of a sequence?
5
Partition Bijection
5
Why is computable function in $\Delta_{1}^0$?
5
Summation of infinite series with hyperbolic sine
5
How can I prove the majority of three languages is also regular if the three languages are regular?
5
Are nonsquares actually squares in extensions of even degree?
5
board game: 10 by 10 light bulbs, minimum switches to get all off?
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