Notation in This Article
is the speed of light, is the gravitational constant. "Geometric variables" are not used.
Latin indexes go from 1 to 3, Greek indexes go from 1 to 4. The Einstein summation convention is used.
is the Minkowski metric. is a tensor, usually the metric tensor. These have signature (−,+,+,+).
Partial differentiation is written or . Covariant differentiation is written or .
Read more about this topic: Alternatives To General Relativity
Famous quotes containing the word article:
“Although there is no universal agreement as to a definition of life, its biological manifestations are generally considered to be organization, metabolism, growth, irritability, adaptation, and reproduction.”
—The Columbia Encyclopedia, Fifth Edition, the first sentence of the article on “life” (based on wording in the First Edition, 1935)