Tim Ratigan's user avatar
Tim Ratigan's user avatar
Tim Ratigan's user avatar
Tim Ratigan
  • Member for 10 years, 10 months
  • Last seen more than 5 years ago
  • Mozambique
46 votes
Accepted

Galois Group of $\sqrt{2+\sqrt{2}}$ over $\mathbb{Q}$

33 votes
Accepted

Prove that the Gaussian Integer's ring is a Euclidean domain

27 votes
Accepted

Definition of "quotient set"

19 votes

Find coefficient of $x^8$ in $(1-2x+3x^2-4x^3+5x^4-6x^5+7x^6)^6$

17 votes

Convergence of the sequence $a_n=\int_0^1{nx^{n-1}\over 1+x}dx$

12 votes
Accepted

Find the basis of the intersection of two vector subspaces

11 votes

What is the point of quadratic residues?

10 votes

Are there any numbers more fundamental than Complex numbers?

8 votes

Is it possible to express $\sin \frac{\pi}{9}$ in terms of radicals?

8 votes

No group of order 200 is simple

8 votes

Why are conjectures about the primes so hard to prove?

8 votes

Trouble solving $\int\sqrt{1-x^2} \, dx$

7 votes
Accepted

Prove $\max \cos(x)$ is $1$ and $\min \cos(x)$ is $ -1$

7 votes

Improper Integral $\int\limits_0^\frac{1}{2}x^n\cot(\pi x)\,dx$

7 votes
Accepted

How to show that a self-complementary graph must have $4k$ or $4k+1$ vertices

7 votes

integral of $x^2e^{-x^2}~dx$ from $-\infty$ to $+\infty$

7 votes
Accepted

Maximum number of edges in a simple graph?

6 votes
Accepted

Abelian Groups properties in finite groups

6 votes

What are the most overpowered theorems in mathematics?

6 votes

How to prove periodicity of a trigonometric function

5 votes

How prove this inequality $(1+\frac{1}{n})^n(1+\frac{1}{2n})>e$

5 votes
Accepted

$\sum_{k=0}^{n} \frac{1}{k!}\leq \left(1+\frac{1}{n}\right)^{n+\alpha} $

5 votes
Accepted

Fano geometry - order

4 votes
Accepted

Cyclic group and prime divisors of its order

4 votes
Accepted

If a "group" has two identities then is not a group

4 votes

Inverse eigenvalue of a linear transformation

4 votes

If each boy knows r girls and each girl knows r boys ,then number of boys=girls

4 votes
Accepted

Equation of a line maintaining equal ratio distance between two points.

4 votes

Prove that the lattice graph of $D_{16}$ is not planar

4 votes

Why is it that "If 3 cannot divide "q" there will be a remainder of 1 or 2"?

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