<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Always cartesian coordinates.</div><div class="">Giovanni</div><div class=""><br class=""></div><br class=""><div><blockquote type="cite" class=""><div class="">On 29 Sep 2016, at 15:36, Murray Daw <<a href="mailto:daw@clemson.edu" class="">daw@clemson.edu</a>> wrote:</div><br class="Apple-interchange-newline"><div class="">
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Are the forces always calculated in cartesian coordinates?
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<div class="">Specifically, when the positions are given in “crystal” coordinates, are the forces in</div>
<div class="">cartesian coordinates or “crystal” coordinates?</div>
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<div class="">Thank you.</div>
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<div class="">…Murray Daw</div>
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____________________________________________________<br class="">
MURRAY S. DAW<br class="">
R. A. Bowen Professor of Physics<br class="">
Dept of Physics & Astronomy<br class="">
Clemson University<br class="">
202A Kinard Labs<br class="">
Clemson, SC 29634-0978<br class="">
Phone: (864)656-6702<br class="">
FAX: (864)656-0805<br class="">
e-mail: <a href="mailto:daw@clemson.edu" class="">daw@clemson.edu</a><br class="">
website <a href="http://daw.people.clemson.edu/" class="">http://daw.people.clemson.edu</a><br class="">
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-- <br class=""><br class="">Giovanni Cantele, PhD<br class="">CNR-SPIN<br class="">c/o Dipartimento di Fisica<br class="">Universita' di Napoli "Federico II"<br class="">Complesso Universitario M. S. Angelo - Ed. 6<br class="">Via Cintia, I-80126, Napoli, Italy<br class="">e-mail: <a href="mailto:giovanni.cantele@spin.cnr.it" class="">giovanni.cantele@spin.cnr.it</a><br class="">Phone: +39 081 676910<br class="">Skype contact: giocan74<br class=""><br class="">ResearcherID: <a href="http://www.researcherid.com/rid/A-1951-2009" class="">http://www.researcherid.com/rid/A-1951-2009</a><br class="">Web page: <a href="http://people.na.infn.it/~cantele" class="">http://people.na.infn.it/~cantele</a><br class="">
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