Cover by Carl D. Meyer, Amy N. Langville

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Chapter Eight

Issues in Large-Scale Implementation of PageRank

On two occasions, I have been asked [by members of Parliament], ‘Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?’ I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question. –Charles Babbage, designer of the Analytical Machine, a prototype of the first computer

That’s a funny quote, but of course, for us the question is: if you put the right (in our case, arbitrary) figures into the PageRank machine, do you get the right answers out? Simple enough to answer. Just check that, for any input π(0) ...

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