Local only sendmail that delivers all mail to a directory
I have a development Ubuntu Server (12.04.1) VM that I use to develop php sites and e-commerce sites (like Magento etc). Because this is for development p...
04 Apr 2026 0 READS
What does ./ mean?
What does ./ mean? For example: Does the following command mean moving files from Gapache2 folder to sites-available: root@ip-10-112-55-203:/etc/mds-1.2-b...
04 Apr 2026 0 READS
![Ratio of angles in a triangle, given lengths of triangle's sides. [closed]](https://edu.smbbmcl.edu.pk/uploads/ratio-of-angles-in-a-triangle-given-lengths-of-triangle-039-s-sides-closed_720.jpg)
Ratio of angles in a triangle, given lengths of triangle's sides. [closed]
If I have a triangle $\,\triangle ABC,\,$ with sides of lengths $\,AB=6, \;BC=4, \;CA=5,\,$ then what can I know about the ratio of $\,\dfrac{\angle ACB}{...
04 Apr 2026 0 READS
Definition of measurability
The alternative definition of measurability is: A subset $E \subset \mathbb{R}^n$ is measurable if for every $\epsilon > 0$ there is a closed set $F \s...
04 Apr 2026 0 READS
Find the derivative at the point $(1, \ln(\pi/4))$ of $x \arctan x = e^y$.
Find the derivative at the point $(1, \ln(\pi/4)$ of $x \arctan x = e^y$. So I think this may be an implicit differentiation problem. I'm not exactly...
04 Apr 2026 0 READS
Drawing an ellipse
You are given a pen, pencil, pair of compasses, scissors, a ruler and a piece of paper. I require a natural way to draw an ellipse. This can be simple, fr...
04 Apr 2026 0 READS
How do I route my internet through a SSH tunnel?
Old Q How do I setup an OpenVPN server without root privileges? Is there a way to setup an OpenVPN server without root privileges? E.g. with configuration...
04 Apr 2026 0 READS
An example of Kirchhoff equation
I'm studying about a simply kind of Kirchhoff equation in one-dimensional that means $$\begin{cases} u_{tt}(x,t)-\left(1+\int_{0}^{1}{u^2_x(x,t)dx}\r...
04 Apr 2026 0 READS
What should the total space be for 4 3TB Drives in RAID10 configuration?
I just configured 4 3TB drives in a RAID-10 configuration but the total disk space in the RAID is 4TB. I used the following guide to setup the RAID-10, RA...
04 Apr 2026 0 READS
How can I change KDE Meta+P options
When I press META+P, I get the following options using KDE: Switch to external screen Switch to laptop screen Unify outputs Extend to left Extend to right...
04 Apr 2026 0 READS
