Daily Dozen: Thu 13 May 11EX: Dozenal has easy divisibility tests for all lower integers except 7 and X.
— Dozenal Society DSA (@dozenal) May 15, 2014
For the 103rd day of the year: 103 is the reverse of 301. The same is true of their squares: 103² = 10609 and 301² = 90601
— jim wilder (@wilderlab) April 13, 2014
On the anniversary of Napier’s death here are a couple of quotes regarding his logarithms;
Napper, lord of Markinston, hath set my head and hands a work with his new and admirable logarithms. I hope to see him this summer, if it please God, for I never saw a book which pleased me better or made me more wonder.
and Laplace said logs
…by shortening the labours, doubled the life of the astronomer.
Read Napier’s bio.
[iframe width=”100%” height=”480″ src=”http://www.youtube.com/embed/BJ7_fFABc9s”]
“…one of the key elements of mathematics, at its best, is the element of surprise.”
Plus article by David Acheson on The element of surprise in mathematics
ZENZIZENZIZENZIC n. The eighth power of a number. ( A word coined by Robert Recorde (c.1512-58), inventor of the = sign)
— The QI Elves (@qikipedia) March 23, 2014
Daily Dozen: Sun 1E Mar 11EX: Dozenal e to four places (2;8752) varies 0;0036% from true; decimal (2.7183) varies 0;0046% from true.
— Dozenal Society DSA (@dozenal) March 23, 2014