From: | | [log in to unmask][log in to unmask], 8 Feb 2008 15:24:49 -0000628_WINDOWS-1252 When you say that "NCS is only a local, not global, crystal symmetry" what you actually mean is that "NCS is only a local not global *group* symmetry", i.e. NCS symmetry obviously *is* global if symmetry is defined (as in physics) as *any* operator which superposes (more or less) 2 copies of the monomer. In fact this isn't correct either because even the localised NCS symmetry operators may not form a group, so the correct statement is "NCS operators can only form a local not global symmetry group, though this is not a necessary condition for NCS.". [...]52_8Feb200815:24:[log in to unmask] |