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Dietrich Burde
  • Member for 9 years, 6 months
  • Last seen this week
  • Austria
75 votes
Accepted

If I know the order of every element in a group, do I know the group?

41 votes
Accepted

Complete classification of the groups for which converse of Lagrange's Theorem holds

38 votes
Accepted

Normal subgroups of dihedral groups

38 votes

Let $A=(a_{ij})$ be an $n\times n$ matrix. Suppose that $A^2$ is diagonal. Must $A$ be diagonal?

37 votes
Accepted

Do commuting matrices share the same eigenvectors?

35 votes
Accepted

Prime numbers the rank of which is also a prime.

30 votes

If the field of a vector space weren't characteristic zero, then what would change in the theory?

25 votes

All Sylow $p$-subgroups of $GL_2(\mathbb F_p)$?

23 votes

What is the correct spelling of Paul Erdős's name?

23 votes

Computing the Galois group of polynomials $x^n-a \in \mathbb{Q}[x]$

23 votes
Accepted

Book recomendation for Elliptic-curve cryptography

22 votes
Accepted

Show how to calculate the Riemann zeta function for the first non-trivial zero

20 votes
Accepted

Would proof of Legendre's conjecture also prove Riemann's hypothesis?

20 votes

Find some digits of $17!$

20 votes

Simple theorems that are instances of deep mathematics

19 votes
Accepted

Finite groups as subgroups of dihedral groups

18 votes

I need to determine the subgroups of the dihedral group of order 8, $D_4$.

17 votes
Accepted

Is there any perfect squares that are also binomial coefficients?

17 votes
Accepted

How do I make this simple proof better (and more correct?)

16 votes
Accepted

$ABAB=0_{n\times n}$, then must $BABA$ be $0_{n\times n}$?

16 votes
Accepted

Largest multiple of $7$ lower than some $78$-digit number?

16 votes
Accepted

What is the intuition behind simple Lie groups?

15 votes
Accepted

Why Zariski topology is not Hausdorff

15 votes

Why is $ (2+\sqrt{3})^n+(2-\sqrt{3})^n$ an integer?

15 votes
Accepted

How to find a Cartan subalgebra of $so(3)$.

14 votes

When is the Killing form null?

14 votes
Accepted

Proof that $\mathbb{Z}\left[\frac{1 + \sqrt{-19}}{2}\right]$ is a PID

14 votes
Accepted

Conjecture: All but 21 non-square integers are the sum of a square and a prime

13 votes
Accepted

Why are the rational numbers not continuous?

13 votes
Accepted

Minimize the product of two positive integers $a,b$ that satisfy $2013+ a^2 = b^2$

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