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The On-Line Encyclopedia of Integer Sequences

Ever wondered what comes next, and why? The On-Line Encyclopedia of Integer Sequences has the answers. (Previously.)
posted by parudox on Mar 10, 2009 - 33 comments

Homework Helper

World of Science contains budding encyclopedias of astronomy, scientific biography, chemistry, and physics. This resource has been assembled over more than a decade by internet encyclopedist Eric Weisstein with assistance from the internet community. MeFi visited Weisstein's Mathworld a couple years ago.
posted by netbros on Feb 18, 2009 - 6 comments

It's more free maths!

Online Encyclopedia of Mathematics Edited by Michiel Hazewinkel (CWI, Amsterdam), and originaly published in dead tree form in 2002, now free to browse and poke into. [more inside]
posted by Iosephus on Aug 2, 2008 - 7 comments

Life is complex: it has both real and imaginary components

More than fifty selected articles from The Princeton Companion of Mathematics (username: Guest, password: PCM) — a thematically-organized compendium of mathematics and mathematicians from Fields Medal-winner Tim Gowers. [via, previously]
posted by Blazecock Pileon on Sep 27, 2007 - 8 comments

Can you stump the Encyclopedia of Integer Sequences?

Can you stump the Encyclopedia of Integer Sequences? Every identifiable sequence known to man, including:

Name: Busy Beaver problem: maximal number of steps that an n-state Turing machine can make on an initially blank tape before eventually halting.
Comment: The sequence grows faster than any computable function of n, and so is non-computable.
Keywords: hard,huge,nice,nonn,bref

If your sequence does not appear there, you might want to try the Super Seeker.
posted by vacapinta on Apr 15, 2002 - 9 comments

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