Source for a coordinate-based formula for Gauss from Riemann

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SUMMARY

The discussion centers on the need for a citeable source that provides the formula for Gaussian curvature at a point on an intrinsically defined Riemannian or Semi-Riemannian manifold, specifically using the intrinsic metric tensor or Riemann tensor. The user seeks a professionally published journal or textbook source, as existing sources are not permissible for citation. The focus is on coordinate-based formulas, particularly in Ricci-style notation, suitable for computational approaches that require explicit mathematical formulations for algorithm development.

PREREQUISITES
  • Understanding of Riemannian and Semi-Riemannian manifolds
  • Familiarity with Gaussian curvature and its computation
  • Knowledge of intrinsic metric tensors and Riemann tensors
  • Proficiency in Ricci calculus and debauch-of-indices notation
NEXT STEPS
  • Research "Gaussian curvature in Riemannian geometry" for foundational knowledge
  • Explore "Ricci calculus" for understanding coordinate-based formulations
  • Investigate "published sources on Riemannian geometry" for citation purposes
  • Learn about "computational methods in differential geometry" for algorithm development
USEFUL FOR

Mathematicians, physicists, and computer scientists involved in differential geometry, particularly those developing algorithms based on Riemannian metrics and Gaussian curvature calculations.

The Bill
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I need a citeable source that gives the formula for the Gaussian curvature at a single point of an intrinsically defined Riemannian or Semi-Riemannian manifold given the intrinsic metric tensor and/or Riemann tensor.

I've got sources for this already, but I'm not "allowed" to use them for this, I need a professionally published journal/textbook source for a citation.
 
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First, I'm not familiar with the gamma-curly braces function the author is applying to the line element. And second, any formula that uses the line element isn't relevant to this thread. I suppose I didn't make it clear, but I'm looking for any variant of a formula in traditional debauch-of-indices Ricci-style. That's what I meant by coordinate-based in the title. Not using coordinate-free notation or methods at all.

This is for a computational approach, too be read by people who just want to see the math they need to write an algorithm to crunch numbers with, nothing more. The manifold will be defined with specific choices of charts already there for the use of the algorithm, so coordinate-free methods are unnecessary.
 

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