Today’s entry is a Theorem of the Day: The Euclid-Euler Theorem: An even positive integer is a perfect number, that is, equals the sum of its proper divisors, if and only if it has the form $2^{n−1}(2^n − 1)$, for some n such that $2^n − 1$ is prime. This theorem describes the relationship between…
Aperiodvent, Day 1: The first 10,000 digits of π dialled on a rotary phone
This is part of the Aperiodical Advent Calendar. We’ll be posting a new surprise for you each morning until Christmas!
The Aperiodvent Calendar, 2015
Here’s our countdown to the festive season featuring a mathematical link, video or oddity each day.
What I’ve done this year
I gave a talk at the big MathsJam conference at the start of this month. It happens annually, so I had a whole year to come up with something interestingly mathematical to entertain my fellow mathmos. When it came time to decide on a topic, I realised I’ve done loads of stuff this year! It…
plotly.js is now open source
Plot.ly is a fairly comprehensive tool for creating whizzy interactive charts from data. It provides a suite of tools to make a whole range of different types of charts. Until now, it’s been a web service you send data away to in order to get a chart back. I’d always been wary of that, because…
Where do old issues of MSOR Connections live online these days?
Christian Lawson-Perfect asks: Where do old issues of MSOR Connections live online these days? @peterrowlett? — Christian Lawson-Perfect (@christianp) November 26, 2015 It’s complicated, but here is what I know.
Ask Clever Hans a question
I’ve put a very clever horse on the internet. He’s called Hans and I’ve made a little video about him. You can ask Clever Hans your own questions! Go to christianp.github.io/clever-hans and make sure your microphone is turned on. Another proviso: I think only Google Chrome supports the special technology I used to make Hans work. Sorry! I’ll explain…