Yahoo! drops Boolean support

From the article:

Greg Notess reports in Online that Yahoo! no longer has full support for Boolean.
[snip]
Now the NOT operator is gone in Yahoo!, and searchers will have to stick to the “search engine math” operator to achieve the same effect. Put a minus-sign directly in front of a term that you want excluded from search result (meaning that Yahoo! will exclude pages that has that term in their text).

Source: Pandia

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