Gandalf3,<br /><br />Regarding your question:<br /><br />> Not
sure why 'non manifold' and 'non-manifold' don't turn up any results,
but 'manifold' gives some.<br /><br />I can't explain "non
manifold", but "non-manifold" does not appear, because in
every instance there is a space between the hyphen and the word
"manifold", , and if the search facilities are case sensitive,
both the initial letters N and M are capitalized, so "Non-
Manifold.<br /><br />Noel Stoutenburg