Mathematica Struggling with Einstein-Hilbert Action Syntax in Mathematica?

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The discussion centers on the challenges faced in varying the Einstein-Hilbert action using Mathematica, specifically regarding syntax issues. The user has successfully derived the results manually but seeks assistance in presenting the topic through a notebook file. There is a suggestion for the user to share the mathematical expressions and source code to facilitate troubleshooting and provide clearer guidance.
Tinuviel
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Hello ,

I was trying to vary Einstein Hilbert action in Mathematica , but the syntax failed me badly.
I have derived the result by hand , but I want to present the topic with nb.file .
Nevertheless, as I said, the syntax is my major concern now.
any help will be appreciated!
thank you
 
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Perhaps if you present the math and the source code of your program someone here will see something.
 

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