05 Oct 20
A course aimed at people who have a strong sense that what Einstein did changed everything but do not know enough physics to understand what he did and why it was so important. The course presents just enough of Einstein’s physics to give students an independent sense of what he achieved and what he did not achieve.
02 Sep 11
Most people use this web site to get information about a particular number sequence. If you are a new visitor, then you might ask the database if it can recognize your favorite sequence, if you have one.
12 May 11
Encoding images under 140 characters.
15 Mar 11
This manifesto is dedicated to one of the most important numbers in mathematics, perhaps the most important: the circle constant relating the circumference of a circle to its linear dimension. For millennia, the circle has been considered the most perfect of shapes, and the circle constant captures the geometry of the circle in a single number. Of course, the traditional choice of circle constant is π—but, as mathematician Bob Palais notes in his delightful article “π Is Wrong!”,1 π is wrong. It’s time to set things right.
19 Dec 10
26 Oct 10
20 Oct 10
17 Sep 10
05 Feb 10
A non-technical introduction to Compressed Sensing
23 Nov 09
A simple concrete example of how quantic computers work.
13 Nov 09
17 Oct 09
Your chances: 3 or fewer letters: about 100% 7 or more letters: about 0%.
The Pi Searcher lets you search for any string of digits (up to 120 of them) in the first 200 million digits of Pi. You can also show any substring of Pi.