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for example the gradient of scalar field to square in the Gauss-Bonnet action?

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closed as unclear what you're asking by Henrik Schumacher, m_goldberg, MarcoB, Yves Klett, rhermans Aug 31 '18 at 8:07

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Hi Israel, and welcome to Mma.SE. Start by taking the tour now and learning about asking and what's on-topic. Always edit if improvable, show due diligence, give brief context, include minimal working example of code and data in formatted form. By doing all this you help us to help you and likely you will inspire great answers. The site depends on participation, as you receive give back: vote and answer questions, keep the site useful, be kind, correct mistakes and share what you have learned. $\endgroup$ – rhermans Aug 31 '18 at 8:09
  • $\begingroup$ Your question was put on-hold because it's not clear what you need. To avoid or revert the Hold you can edit your question to improve it and make it specific, well-structured and easy to understand. You must include minimal working example of code you have tried in formatted form. Please don't be discouraged by that cleaning-up policy. Your questions are and will be most welcomed. Learn about good questions here. $\endgroup$ – rhermans Aug 31 '18 at 8:10

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