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I started using xAct to perform some computations. I copied the xAct folder in the /.Mathematica/Applications folder in my Ubuntu system. I loaded it and created the manifold and defined the metric. The output however is not coming right on using the ordinary derivative PD[].

PD[-a][PD[-b][T[c, d, -e]]]

Out: $PD(-a)(PD(-b)(T(c,d,-e)))$

Does anyone know how to resolve this? Also whenever I click the xAct option in the Addons page of Mathematica, the screen freezes. I am using Mathematica 10.

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  • $\begingroup$ IN: PD[-a]@ PD[-b]@T[c, d, -e] is the correct command. $\endgroup$ – SUMAN KUNDU Oct 31 '19 at 6:24
  • $\begingroup$ @SUMANKUNDU isn't it the same command? $\endgroup$ – Kuba Oct 31 '19 at 7:01
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Format --> Option Inspector..." --> set "show option values" to "Global Preferences" --> type "OutputToStandardForm" in the search box and set the option setting to "True" ---> click on "Apply".

I believe this should work.

If the problem remains and you have Mathematica 11 then you can also try : Edit-->Preferences-->Evaluation and set the "Format type of new output cells" to "StandardForm"

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