<div>Dear Stefano Baroni:</div>
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<div>>YOU have written the answer to your question<br>>"If .true. the bands are classified according to the irreducible representations of the small group >of k" (which is the only sensible thing to do)</div>
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<div>Sorry, I almost forgot the definition of "small group".</div>
<div>I refered to text book and found the answer :)</div>
<div>Thank you for your concise reply :)</div></div>
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<div>____________________________________<br>Hui Wang<br>School of physics, Nankai University, Tianjin, China </div>