The tri-rods.ctl control file

"Kai Lin Woon" <[email protected]>
Newsgroups gmane.comp.science.photonic-bands
Message-ID <[email protected]> 
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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