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+1 vote

Hi,

I have a problem with the command JOIN. I typed the following

{m,n,p,q}::Indices;
\Gamma_{#}::GammaMatrix(metric=g);

ex:= \Gamma_{mn} \Gamma_{p};

and when I applied the algorithm JOIN: join_gamma(ex) I got

\Gamma_{mnp} + g_{mnp}

I do not know what it is happening. Do you have any idea to solve this problem?

Thanks,

in General questions by

1 Answer

+1 vote

You need to separate index names by a space,

{m,n,p,q}::Indices;
\Gamma_{#}::GammaMatrix(metric=g);
ex:= \Gamma_{m n} \Gamma_{p};
join_gamma(_);
by (76.2k points)
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