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In Coleman's proof of Mermin-Wagner theorem, he mentioned Baumel has proved a lattice version of result and referred it as , but  says "Private communication". I wonder if Baumel's work was published at all and where to find it?
Probably not. The query ''author:Baumel lattice'' (without quotes) on scholar.google.com produced 5 items only, none of which applies.
@ArnoldNeumaier, OK, good to double check. Thanks.
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