Reputation
4,827
Top tag
Next privilege 5,000 Rep.
Approve tag wiki edits
Badges
1 13 28
Newest
 Steward
Impact
~89k people reached

Apr
1
reviewed Leave Open Probability of exactly k out of n events occuring
Apr
1
reviewed Close “If a group $G$ is cyclic, then it has no proper subgroups.” True or false?
Apr
1
reviewed Close Negative integers congruent modulo m
Apr
1
reviewed Leave Open Parametric representation of a plane cut of a sphere at y=5
Mar
31
reviewed Leave Open Relation between Hermite polynomials and Brownian motion (on martingale property)
Mar
31
reviewed Close $n^3 + n^2 + n + 1 = m^2$ for positive integers $m$ and $n.$
Mar
31
reviewed Close Bijection between natural numbers $\mathbb{N}$ and natural plane $\mathbb{N} \times \mathbb{N}$
Mar
31
reviewed Close What is $T>0$ large enough such that $\mu\left(B\right)<\varepsilon$?
Mar
31
reviewed Leave Open Show that there are only finitely many subgroups of $F$ in which $H$ can be of finite index.
Mar
31
reviewed Close Properties of the number 50
Mar
31
reviewed Close Compute Limit of an infinite sum
Mar
31
comment Prove that for all naturals $n \ge 6$ there is a set of $n$ positive naturals, $a_1$ to $a_n$ such that $\sum_{i=1}^n \left(\frac{1}{a_i}\right)^2 =1$
$\{2, 2, 2, 2\}$ is not a set. You might want to check that you're solving the right problem.
Mar
31
reviewed Close Using calculus, determine how fast the car is travelling.
Mar
30
reviewed Reopen Estimating partial sums $\sum_{n = 1}^m \frac{1}{\sqrt{n}}$
Mar
30
reviewed Leave Open Is there a function $f:\mathbb{R}\to\mathbb{R}$ such that $f\circ f\circ f=Id.$, but $f\neq Id.$?
Mar
30
reviewed Close Proving the equations $x_1+\dots+x_n=0$, …, $x_1^n+\dots+x_n^n=0$ have a unique solution
Mar
30
reviewed Close Evaluate:$\int_0^{\pi/2}\frac{x \sin x \cos x}{(a^2 \cos^2 x+b^2 \sin^2 x)^2}dx$
Mar
29
reviewed Close Integral of $\big((1+\cos(x))\sin(x)\big)^2$
Mar
29
reviewed Close $\sin(\pi - a) = \sin (a)$. How/why?
Mar
29
comment $\sin(\pi - a) = \sin (a)$. How/why?
What's your definition of $\sin$? Is it in terms of triangles or complex exponentials?