Anti-de Sitter space bell. It might be described as being the "opposite" of the surface of a sphere, which has a positive curvature. General relativity is a theory of the nature of time, space and gravity in which gravity is a curvature of space and time that results from the presence of matter or energy. Energy and mass are equivalent (as expressed in the equation "E" = "mc"), and space and time can be translated into equivalent units based on the speed of light ("c" in the "E" = "mc" equation). A common analogy involves the way that a dip in a flat
Price equation Price equation also has applications in economics. Examples of the Price equation can be found here: Price equation examples. The Price equation shows that a change in the average amount "z" of a trait in a population from one generation to the next ("Δz") is determined by the covariance between the amounts "z" of the trait for subpopulations "i" and the fitnesses "w" of the subpopulations, together with the expected change in the amount of the trait value due to fitness, namely "E(w Δz)": Here "w" is the average fitness over the population, and E and cov represent the population