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First bullet in intro says "In held fixed in space, where an end of a beam is held at a fixed position in space." This isn't grammatical English, and I'm not sure what it's supposed to mean, so I can't edit it. The other bullets have "In <Plural Noun>", so maybe this should be s.t. like "In physical situations where one end of a lever is held fixed in space." But I dunno, I just know it doesn't make sense as-is. Mcswell (talk) 19:17, 27 July 2013 (UTC)
In mechanical engineering (beam theory), where one end of a beam is held at a fixed position in space. Seems to me that for real Dirichlet boundary conditions, you want both ends fixed. You could have mixed boundary conditions, some combination of Dirichlet and Neumann. Gah4 (talk) 18:11, 16 June 2016 (UTC)