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This book by Douglas Hofstadter is in my general science reading list (not finished Gleick`s 'Chaos' yet, one at a time). As a useful introduction to the work someone sent me a link to this MIT opencourseware lecture series, nice action.
![](http://ocw.mit.edu/OcwWeb/images/logo-ocw-home_new.gif)
the inversion of every element not in the set
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