April 28, 2008

Laws take the same form in every reference frame.
Define the infinitesimal distance between two points.
Contravariant, covariant vectors, invariant inner product.
Summation convention.
Examples of fields in Nature.
The four-dimensional Lagrangian.
The Action Principle in four dimensions.

  • Principle of covariance
  • Action principle
  • Summation convention
  • Contravariant, covariant vectors
  • Tensors