Search help: Boolean searches

Ultraseek operator	Boolean equivalent
default operator: you need not use any special symbols	OR
+	AND
-	NOT
phrase operator: enclose the phrase with double quotation marks	ADJ

Boolean queries use the logical operators AND, OR, NOT and ADJ (adjacent). Suppose you wanted to find plain paper color laser printers made by companies other than HP. This query can be specified in Boolean logic as:

(laser ADJ printer) AND (color OR (plain ADJ paper)) AND NOT (HP OR Hewlett-Packard)

+"laser printer" color "plain paper" -HP, -Hewlett-Packard

• All returned documents must contain the phrase "laser printer".
• Documents containing one or more of the terms "laser printer", color, or "plain paper" will be ranked at the top (the more terms matched, the higher the ranking).
• None of the documents returned will contain either HP or Hewlett-Packard.

A traditional Boolean search returns an unsorted list of all items that match the search condition. Ultraseek goes considerably beyond this by using advanced statistical search technology to return the results sorted with the "best" matches listed at the top. Unlike plain Boolean searches, Ultraseek automatically weights your query terms based on their statistical uniqueness. Common terms, such as "shall," get a much lower weighting than less frequently occurring terms, such as the phrase "golf courses."

Ultraseek's advanced statistical weighting allows you to just type in relevant words and phrases, and the system will provide the answer to your query in the top few documents! Since there are cases in which it is convenient to narrow a query using Boolean operators, Ultraseek allows you to use the + and - Boolean operators. With Ultraseek, you get the accurate ranking of statistical searching combined with the information filtering of Boolean searching.