PageRank is a link analysis algorithm, named after Larry Page, used by the Google
Internet search engine that assigns a numerical weighting to each element of a hyperlinked
set of documents, such as the World Wide Web, with the purpose of "measuring" its
relative importance within the set. The algorithm may be applied to any collection
of entities with reciprocal quotations and references. The numerical weight that
it assigns to any given element E is referred to as the PageRank of E and denoted
by PR(E).
The name "PageRank" is a trademark of Google, and the PageRank process has been
patented (U.S. Patent 6,285,999). However, the patent is assigned to Stanford University
and not to Google. Google has exclusive license rights on the patent from Stanford
University. The university received 1.8 million shares of Google in exchange for
use of the patent; the shares were sold in 2005 for $336 million.
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