Albert Girard (1595-1632) was a French-born mathematician who studied at the University of Leiden. He was the first to use the abbreviations ‘sin’, ‘cos’ and ‘tan’ for the trigonometric functions.

## Posts Tagged 'Pi'

### Fermat’s Christmas Theorem

Published December 25, 2014 Occasional Leave a CommentTags: Arithmetic, Number Theory, Pi, Primes, Spherical Trigonometry

### The remarkable BBP Formula

Published August 8, 2013 Occasional Leave a CommentTags: Archimedes, Computer Science, History, Number Theory, Pi

Information that is declared to be forever inaccessible is sometimes revealed within a short period. Until recently, it seemed impossible that we would ever know the value of the quintillionth decimal digit of pi. But a remarkable formula has been found that allows the computation of binary digits starting from an arbitrary position without the need to compute earlier digits. This is known as the BBP formula.

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### Happy Pi Day 2013

Published March 14, 2013 Occasional Leave a CommentTags: Archimedes, Number Theory, Pi

Today, 14th March, is Pi Day. In the month/day format it is 3/14, corresponding to 3.14, the first three digits of π. So, have a Happy Pi Day. Larry Shaw of San Francisco’s Exploratorium came up with the Pi Day idea in 1988. About ten years later, the U.S. House of Representatives passed a resolution recognizing March 14 as National Pi Day.

Today is also the birthday anniversary of Albert Einstein, giving us another reason to celebrate. He was born on 14 March 1879, just 134 years ago today.

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### Archimedes uncovered

Published January 3, 2013 Irish Times Leave a CommentTags: Archimedes, History, Pi

The *That’s Maths* column in this week’s* Irish Times* ( TM012 ) describes the analysis of the ancient codex known as the Archimedes Palimpsest.

**Archimedes of Syracuse **

Archimedes (Ἀρχιμήδης, 287-212 BC) was a brilliant physicist, engineer and astronomer, and the greatest mathematician of antiquity. He is famed for founding hydrostatics, for formulating the law of the lever, for designing the helical pump that bears his name, for devising engines of war, and for much more. Continue reading ‘Archimedes uncovered’