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Questions on manipulating complicated expressions and making them look simpler using Simplify, FullSimplify and Reduce.

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in xAct, simplify output expression by specfic the form a function with ReplaceAll or Simplify

in xAct, at the beginning I define a function H1(t,r) that depends on two variables using the command DefScalarFunction, then I want to simplify an output expression containing H1 and its derivatives …
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