I shall look at the contributions to this thread with interset!
I don't claim my version to be spectacularly good, indeed I'm aware that I
actually assume the reader understands the fundamental concept of a
'Boolean expression' but anyway I offer my set of explanatory notes ...
My main search page is at http://wwwsearch.ox.ac.uk/
If you take the 'additional notes' link near the bottom you will find
yourself on a verbose copy of the search page for the first time user.
regards,
Malcolm.
[EMAIL PROTECTED] http://users.ox.ac.uk/~malcolm/
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