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Feb 12, 2014 at 14:17 comment added Kai Li @ Xiao-Gang Wen Dear prof.Wen, what does the term 'sub-lattice' mean in your answer? For example, is a triangular lattice viewed as containing only one 'sub-lattice' or three 'sub-lattices'?
May 29, 2012 at 20:50 history edited Xiao-Gang Wen CC BY-SA 3.0
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May 28, 2012 at 13:01 history edited Xiao-Gang Wen CC BY-SA 3.0
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May 27, 2012 at 4:25 history answered Xiao-Gang Wen CC BY-SA 3.0