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filipos
  • Member for 7 years, 11 months
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20 votes

How did the rule of addition come to be and why does it give the correct answer when compared empirically?

9 votes

Give an example of a nonabelian group in which a product of elements of finite order can have infinite order.

8 votes

Why is it useful to show the existence and uniqueness of solution for a PDE?

6 votes

How to determine if two lines are parallel/ almost parallel?

5 votes

$a+\frac{1}{a}\ge 2$ for $a\in\mathbb{R}_{+}$

5 votes

Why do we say function "parameterized by" vs just function of (x,y,z,...)?

4 votes

How to prove that a complex number is not a root of unity?

4 votes
Accepted

Show that the special unitary group $SU(n)$ is a compact topological group

4 votes

Prove $\binom{3n}{n,n,n}=\frac{(3n)!}{n!n!n!}$ is always divisible by $6$ when $n$ is an integer.

4 votes

Problem with basic definition of a tangent line.

4 votes

Does this Fractal Have a Name?

3 votes
Accepted

Is it true that when $X$ is a positive matrix and $Y$ is a self adjoint matrix then $XY$ is positive??

3 votes
Accepted

Finding the 2 fake balls.

3 votes

Closed form equation for win percentage of two battling armies

3 votes

There's no continuous injection from the unit circle to $\mathbb R$

3 votes
Accepted

Little confusion about connectedness

2 votes

Why does $\frac{1}{{\left\| {\left| {{A^{ - 1}}} \right|} \right\|}} \le \left\| {\left| B \right|} \right\|$?

2 votes

Is the perimeter of a square isometric to the circle? Homeomorphic?

2 votes

Show that $(\sqrt{2}-1)^n$ is irrational

2 votes

Proving the given identity in group

2 votes
Accepted

True of False: If $f(x)\to 0$ as $x\to a+$ and $g(x)\ge 1$ for all $x\in \mathbb R$, then $g(x)/f(x)\to \infty$ as $x\to a+$

2 votes

Reducibility of a fraction

2 votes

Asymptotically unbiased estimator for 1/p in Bernouilli distribution?

2 votes
Accepted

Find maximum and minimum values for n digits in base d

1 vote
Accepted

How do I weight Win/Loss Percentage Based on Games Played?

1 vote
Accepted

statistics of aggregated random variable

1 vote
Accepted

Find fake rocks from $2\cdot n$ rocks

1 vote

Why is $\text{Exterior}(A) = \text{int}(A^c) = \text{cl}(A)^c$?

1 vote

Find the edge angle of a dodecahedron using spherical trigonometry?

1 vote
Accepted

Two ways of inducing a metric/topology on a manifold.