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Alternative timeline of math history… 15-ft-long wall poster |
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| π ≈ 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342… click for the first million digits! |
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| The PiFactory blog |
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Assessment | Books | Tees + mugs |
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Welcome to The PiFactory — resources for math teachers and their studentsA malware attack knocked me back to a bare announcement, but I'm on the way back. I've got the basic structure sorted… so I've put the site back up and am adding more useful free stuff day-by-day. The angry and opinionated PiFactory Blog, with lots of links to useful international research, plus Tees + Mugs are all linked and have good stuff. A range of books are available. Assessment is on its way back with mindmaps of descriptive approaches to grading and how a non alpha-numeric, descriptive feedback gradebook looks. More to come soon. Algebra resources are back — with more to follow soon. Number resources are back — also with more to follow soon. Mindmaps can be downloaded, but not as easily as I want. You can get them with effort, see the page for help. Geometry resources are on the way back — also with more to follow soon. The old award-winnning PiFactory resources are still available, but no longer updated. The big aim is to add a database of searchable math learning targets plus notes — a sort of on-line textbook — plus questions linked to the targets. If you click on those links you'll see it's still under construction. Please bear with me and keep coming back&hellip If you have any requests or comments email: infoATpifactory.net… replace AT with @. Thanks. Last updated: Sunday 31 May, 2009 |
MARY HENRY, whose abstract art is a particular delight for lovers of geometry, has died aged 96. An exhibition of her work can be seen at PDX Contemporary Art, 925 NW Flanders, Portland, OR 97209 until the end of May. New biggest prime foundThe biggest prime number yet has been found with some 12,978,189 digits. It would fill nearly 20 paperbacks if printed out. It's also the 45th known Mersenne prime, a rare sort of prime written as a power of 2 subtract 1: 243,112,609 − 1. That's 2 multiplied by itself 43,112,609 times and then subtract 1. A prime number can only be divided by the number 1 and itself — it has only two factors. The discovery by the UCLA math department qualified for a $100,000 award for the first prime of more than 10 million digits. It was discovered using software from the Greater Internet Mersenne Prime Search — GIMPS — that allows anyone with a PC or laptop to help search for the next largest prime. This new big prime was discovered in August 2008. Just two weeks later another — smaller — 46th Mersenne prime was discovered near Cologne, Germany: 2 37,156,667 − 1. It has a mere 11,185,272 digits. Mersenne primes were first discovered by the French monk and mathematician Marin Mersenne more than 300 years ago. Searching for primes was the sort of thing maths people did for fun, they still do. But now super-big primes are vital in internet and banking security as well as writing ultra-secret codes. Mathematicians know there are an infinite number of primes. They think there an infinite number of Mersenne primes, but the conjecture has yet to be proved. |
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