Talk:Herpolhode
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Information on the origin of the word should be added. Also, the reference to Goldstein should be done to the second edition, that cites other references in a footnote. In particular, the concavity property comes from one this footnote, while the annulus property is mentioned in Arnold. [[[User:Marcosaedro|Marcosaedro]] (talk) 17:19, 29 November 2011 (UTC)]