ConstructDDIs & SolveTensors: Bug or wrong usage?

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Giorgos

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Oct 19, 2025, 8:55:20 AM (9 days ago) Oct 19
to xAct Tensor Computer Algebra
Hey everyone,

As you will see in the attached notebook. I'm trying to generate some DDIs using xTras. However, the result generated by SolveTensors is obviously problematic. There are terms that have R in the denominator, and another rule that sends R->0. I have noticed that whenever the result of SolveTensors is given as an array of arrays instead of a single array such weird rules/results are generated. Sometimes the same rule is generated twice, or the same quantity equals 2 different things.

Am I doing something wrong here? How can I generate DDIs that can be trusted?

Thank you in advance,

George
ConstructDDIs weird behaviour.nb
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