Wow!
16 February 2010
I’m told that the logic of the Amazon ranking system algorithm has defeated the best mathematical minds in the world, leading at least one doctoral candidate to conclude it included a few random numbers generated by random calculations of other random numbers.
And, it changes by the hour, but even so… I’m not complaining.
Of course, I get a bigger cut if you order the paper version (which is only a few dollars more) direct from the publisher.
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mexfiles.net 
I bought my copy at Librería Sandi in Guadalajara … highly recommended.