According to the file:
(set! geometry-lattice (make lattice (size 1 1 no-size)
(basis1 ) (/ (sqrt 3) 2) 0.5)
(basis2 (/ (sqrt 3) 2) -0.5)))
I wonder anyone know what the hell does it mean by(/ sqrt 3) 2)?????
Cheers
KL Woon
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