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draks ...
  • Member for 10 years, 9 months
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39 votes

What is a negative number?

22 votes

Funny identities

22 votes

Real life examples of commutative but non-associative operations

14 votes

Is it possible to elementarily parametrize a circle without using trigonometric functions?

13 votes
Accepted

Finding sum of factors of a number using prime factorization

12 votes

What does this "subset" symbol mean?

12 votes

Proving that $\sum\limits_{i=1}^k i! \ne n^2$ for any $n$

11 votes
Accepted

Interpolating the primorial $p_{n}\#$

10 votes
Accepted

What is the sum of $\sum\limits_{i=1}^{n}ip^i$?

9 votes
Accepted

Properties of sum of real symmetric, positive semi-definite matrices

9 votes

Example of a conjecture/theorem which required an entirely new idea to prove

8 votes
Accepted

Are these two facts related?

8 votes

Sum of all elements in a matrix

8 votes
Accepted

Do there exist infinitely many primes $p$ such that $a^{p-1}\equiv 1$ $\text{mod } p^2$ for fixed a?

8 votes

Algorithm(s) for computing an elementary symmetric polynomial

8 votes

Solution af a system of 2 quadratic equations

8 votes

What are the properties of a prime number?

8 votes

Inverse of circulant matrices

7 votes
Accepted

About the Continuum Hypothesis

7 votes
Accepted

A mathematical way for defining the $\operatorname{Floor}$ and $\operatorname{Ceiling}$ functions

7 votes

Fibonacci trick and proving it.

6 votes
Accepted

Derivative of sinc function

6 votes
Accepted

Limit of a sequence involving root of a factorial: $\lim_{n \to \infty} \frac{n}{ \sqrt [n]{n!}}$

6 votes
Accepted

2x2 Matrices and Differences of Fractions

6 votes

Evaluating $\frac{1}{2\pi}\int_{0}^{2\pi}\frac{1}{1-2t\cos\theta +t^2}d\theta$

6 votes

Can you provide me historical examples of pure mathematics becoming "useful"?

6 votes
Accepted

Prime factorization of $10^n+1$

6 votes

Limit for sequence with $e$-function

6 votes

Are there connected, planar graphs of size $N$ with minimal degree $\left( N−2 \right)$ for any $N \in \mathbb{N}$?

6 votes

Why are the trivial zeros of the Riemann zeta function only negative?

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