The general field that includes techniques such as vector space algorithms is termed 'Information Retrieval'. A good book on this is "Information Retrieval: Data Structures and Algorithms" by William Frakes and Ricardo Baeza-Yates.

If you are interested in this stuff, a fun package for playing around with IR is the SMART system developed at Cornell.

-Mark

In reply to Re: OT: Vector based search engine by kvale
in thread OT: Vector based search engine by Ryszard

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