Fix broken link to Radul's thesis

The old link is broken; perhaps [the new one](http://groups.csail.mit.edu/genesis/papers/radul%202009.pdf) is to the right thing.
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Buck Shlegeris 2019-10-31 08:11:40 -07:00 committed by GitHub
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@ -5,7 +5,7 @@ propagators
Propagators propagate increases in information from cell to cell.
They are described (using Scheme) in Alexey Radul and Gerald Sussman's ["The Art of the Propagator"](http://web.mit.edu/~axch/www/art.pdf) as well as in Alexey Radul's thesis on [Propagation Networks](http://web.mit.edu/~axch/www/phd-thesis.pdf).
They are described (using Scheme) in Alexey Radul and Gerald Sussman's ["The Art of the Propagator"](http://web.mit.edu/~axch/www/art.pdf) as well as in Alexey Radul's thesis on [Propagation Networks](http://groups.csail.mit.edu/genesis/papers/radul%202009.pdf).
This package explores design options for propagators in Haskell. The primary innovation here (beyond the published work) is the use of observable sharing to let us take a more direct form of programming and transform it back and forth to the propagator style.