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Science News
August 17, 2002
Ivars Peterson |
Testing for Divisibility Few people, including many mathematicians, know all the simple rules by which large numbers can be tested quickly for divisibility by numbers 1 through 12. Nonetheless, they can be handy for solving digital puzzles, reducing fractions, and as targets for algorithm development.   |
Science News
December 14, 2002
Ivars Peterson |
A Trillion Pieces of Pi Computer scientist Yasumasa Kanada and his coworkers at the University of Tokyo Information Technology Center have now succeeded in computing 1,241,100,000,000 decimal digits of pi, smashing their own previous world record of 206,158,430,000 digits, set in 1999. |
Science News
October 1, 2005
Ivars Peterson |
Numbers of No Escape Why do such mathemagical black holes occur? In general, processes that turn large inputs into significantly smaller outputs can quickly reduce even an infinite universe of starting points to a manageable, finite set of cases. |
Science News
April 10, 2004
Ivars Peterson |
From Number Puzzles to Automata Number puzzle leads to automata theory. |
Science News
February 24, 2001
Ivars Peterson |
Appealing Numbers It's amazing how much effort has gone into tracking down amicable numbers, which have practically no application in mathematics. They have a curious appeal that has endured for millennia... |
PC Magazine
September 2, 2003
Neil J. Rubenking |
Windows XP Changes Filename Sorting Win XP's new and dramatically different file-sorting algorithm can wreak havoc on some legacy programs. |
PC Magazine
October 19, 2004
Neil J. Rubenking |
Excel Fails to Store Credit Card Numbers When entering numeric data over 15 digits long, prefix the data with a single quote ('). This forces Excel to treat the data as text. |
Science News
November 15, 2003
Ivars Peterson |
Cool Rationals One of my more distinct recollections of math class involves the decimal representation of rational numbers and the discovery of wonderful patterns among those digits. A new paper finds fascinating new patterns and provides some numerological explanations. |
Fast Company
December 1, 2006
Alyssa Danigelis |
Publishing's New Math: 14 > 13 Will the publishing industry finally get its data in sync with the rest of the world? |
Science News
January 4, 2003
Ivars Peterson |
Sound-Byte Math Music Swedish composer Daniel Cummerow has created mathematical sound bytes belonging to a category known as algorithmic music. Each musical fragment is determined by a mathematical recipe -- a formula that links digits with musical notes and their duration... |
