EQ. Ed Pegg Returns
Ed Pegg, of mathpuzzle.com , Wolfram research and consultant to the TV show Numb3rs, returns to discuss cellular automata and a fiendishly difficult puzzle.
Archive for October, 2008
EP. HIPE
Peter Winkler discusses the bonus chapter, on the word game HIPE, in his book, Mathematical Mind Benders!
Follow Up: Loops and the Harmonic Series.
In an earlier post Spaghetti Loops, we asked several problems that we promised had something to do with the number e.
The first question really has to do more with the famous harmonic series; in this post we showed that the sum
1 + 1/2 + 1/3 + 1/4 + …. + 1/n
adds up to about the natural log of n, plus a small constant, Euler’s γ ≈ .577215664901… In other words, to sum up to, say N, at least e(N- γ) terms are used.
Paperdolls!
The topology of paper doll folding patterns explains geometrical symmetries, as Chaim explains in this short video:
(And much more deeply in The Symmetries of Things.)
The video was produced by Research Frontiers, at the University of Arkansas
EO. Spaghetti Loops
Just why does e appear in so many guises?
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