# Category: Blog

## The Slide Rule Watch

Now that’s a word that’s a blast from the past: The Slide Rule. I was born in 1991 and when I was old enough to learn about numbers, the digital calculator has already replaced the slide rule – an analogue calculator that, as the name suggests, required the physical...
## Things to Reconsider: The Integral of $$\frac{1}{x}$$
Absolute Absolutes? Consider the following integral: $\int \frac{1}{x}\,dx = \log_e|x| + C$ When learning this integral, teachers often stress the need to include the absolute value signs. The reasoning behind this is often to do with the fact that the logarithm of a negative number is undefined. However, is...