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Intereting Posts

Evaluating and proving $\lim_{x\to\infty}\frac{\sin x}x$
$1+a$ and $1-a$ in a ring are invertible if $a$ is nilpotent
Equivalent definition of exactness of functor?
Write $1/1 + 1/2 + …1/ (p-1)=a/b$ with $(a,b)=1$. Show that $p^2 \mid a$ if $p\geq 5$.
Show that if $f$ has compact support, then its Fourier transform cannot have compact support unless $f=0$.
Proving that every patch in a surface $M$ in $R^3$ is proper.
Evaluation of $\displaystyle \int_{0}^{\pi}\ln(5-4\cos x)dx$
When does a system of equations have no solution?
Show that the set of functions $\mathbb{N}\to\{0,1\}$ is not countable
Find coordinates of equidistant points in Bezier curve
Deal or no deal: does one switch (to avoid a goat)?/ Should deal or no deal be 10 minutes shorter?
Explicit fractional linear transformations which rotate the Riemann sphere about the $x$-axis
Finding the location of the end of an arc, knowing the beginning, the arc's length and the radius
In an extension of finitely generated $k$-algebras the contraction of a maximal ideal is also maximal
Is Orzech's generalization of the surjective-endomorphism-is-injective theorem correct?