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physop package problem

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Andy
2011-12-04
2012-11-20
  • SOMETHING HERE

     
  • Hm, It works here as shown in the physop documentation. What is the built date of your REDUCE? I remember that I fixed a problem in that code some time ago. Can you build from svn and try?

     
  • Andy
    Andy
    2011-12-05

    Hi eschruefer,
    thank you very much for your answer!!

    On http://sourceforge.net/projects/reduce-algebra/files/  I followed the link after "Looking for the latest version?" which was not the newest. Now I downloaded the newer one which works :-)

    Just a short other question - is there a possibility to use something like the kronecker-delta? I want to express something like:
    LET COMM(A(j), B(k)) = kroenecker(j,k);

    Thank you very much,

    Andy

     
  • Andy,

    Good to hear that the latest version works. Concerning the use of a Kronecker delta you could just define an
    operator (as it is done in the physop test file) and use let rules to define its properties if needed.

    Eberhard

     
  • Andy,

    Could you please tell me why you think your indicated term should be zero? My hand calculation confirms
    the result physop returns. Maybe we should continue this discussion via private e-mail.

    Eberhard

     
  • Andy
    Andy
    2011-12-06

    Hi Eberhard,

    this maybe the best way. My email-adress is ALueckegmx.net - Can you write me a mail - so that I have your adress and can tell you my way to calculate the commutator? Can I speak german with you?

    Andy

     
  • Andy
    Andy
    2011-12-08

    For the case that someone has similar problems. Eberhard found my mistake:
    Commands like "FOR ALL N,M LET ANTICOMM(C(N),C(M))=0" are ignored unless the command "NONCOM C, C" is used. The way I used the NONCOM-command before is not enough.