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In page 3 of PageRank paper is mentioned:

let c be a factor used for normalization (so that the total rank of all web pages is constant).

What is the use of c and how can its value be computed?

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The point of such a factor in general is that you want to be able to calibrate the scores you get, by forcing them to be within a specific range like $[0,1]$. In particular, this factor would be computed (in principle) by getting the rank of all pages and then dividing by their sum.

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