Archive for 2006

BG. Bamboopalooza!

Join Chaim and Kyle at Bamboopalooza 3! Octahedral pencil holders, giant 12 pointed bamboo stars, pig lighters and other mathematical oddments were enjoyed by all! Read the rest of this entry »

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BF. Catching Errors

Credit card numbers have an error catching code, that uses the tricks of the last few weeks.


BE. Trap door encryption

Is this podcast legally a “munition”? Old ideas in number theory are the basis for a whole new class of powerful encryption schemes that underlie the modern internet economy.

We just use the tools we discussed in the last couple of weeks, in a new way.


BD. Magic Numbers

We discuss a neat trick involving powers, mod a pair of primes.


BC. Casting Out Nines

How do modern “trap-door” encryption schemes work? Over the next three weeks we'll explain, but to warm up, we talk about the medieval practice of “casting out nines”.


BA. The Ring is Exchanged

Peter Winkler answers his puzzle set in the Land of Kleptomaniacs, and we chat about Martin Gardner. We'll pose another puzzle next week!

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AZ. Another puzzle from Peter Winkler

We answer last week's puzzle and Peter Winkler asks how to send a ring through the land of the kleptomaniacs.


AY. Dollar Cost Averaging

A common investment strategy takes advantage of the subtleties of averaging.


AX. Averages are not what they seem!

Is a man of perfectly average height, and perfectly average weight, too heavy for his size? Averages are not what they seem to be.


AW. Will we run out of Social Security Numbers?

When will the crisis come? When will we run out of Social Security Numbers, and other musings.

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