Pi

The mathematical constant ? is the ratio of a circle's circumference (Greek ??????????, periphery) to its diameter and is commonly used in mathematics, physics, and engineering. The name of the Greek letter ? is pi (pronounced pie), and this spelling can be used in typographical contexts where the Greek letter is not available. ? is also known as Archimedes' constant (not to be confused with Archimedes' number) and Ludolph's number.

External links

Digit resources

• Project Gutenberg E-Text containing a million digits of Pi
• Archives of Pi calculated to 1,000,000 or 10,000,000 places.
• Search π – search and print π's digits (up to 3.2 billion places)
• Statistics about the first 1.2 trillion digits of Pi
• A banner of approximately 220 million digits of pi

Calculation

• Calculating Pi: The open source project for calculating Pi.
• Background Pi: An open source project for calculating Pi over many computers. (Inspired by "Calulating Pi", Above)
• PiFast: a fast program for calculating Pi with a large number of digits
• PiHex Project
• Super Pi: Another program to calculate Pi to the 33.55 millionth digit. Also used a benchmark
• PiSlice: A distributed computing project to calculate Pi
• - open source Python code

General

• J J O'Connor and E F Robertson: A history of Pi. Mac Tutor project
• A collection of Machin-type formulas for Pi
• A proof that Pi Is Irrational
• PiFacts-Record Broken
• The Joy of Pi-About the Book
• From the Wolfram Mathematics site lots of formulae for π
• Pi Symphony : An orchestral work by Lars Erickson based on the digits of pi and 'e'.
• PlanetMath: Pi
• The pi-hacks Yahoo! Group
• Finding the value of Pi
• Proof that Pi exists
• Friends of Pi Club (German and English)
• Determination of Pi
• LucyTuning - musical tuning derived from Pi
• The Pi Is Rational Page

Mnemonics

• One of the more popular mnemonic devices for remembering pi
• Andreas P. Hatzipolakis: PiPhilology. A site with hundreds of examples of π mnemonics
• Pi memorised as poetry
• Phrase to easily remember upto 8 decimal places of the value of Pi (See Item #3 on page)
• Free software to help memorise Pi

Creationism / Intelligent Design

• Jochen Katz, Pi in the Bible
• Darrick Dean, Mathematical Signatures in Nature: A Sign of Design?