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Re: emptyset symbols

the two slashed o's in cmr are norwegian letters -- text only.

the \emptyset provided by knuth (in cmsy) is a slashed zero --
this is shaped.

the variant emptyset in the ams fonts (which the ams prefers)
is a slashed circle -- geometric.

the latter two are both used; which one i think is almost always
a matter of house style.
                                                -- bb