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
E=MC² (Mariah Carey album) "I'm That Chick". As the release date drew near, the title was changed to "E=MC²", in reference to Carey's previous album, "The Emancipation of Mimi" (2005). The title signifies "(E) Emancipation (=) of (MC) Mariah Carey (²) to the second power". It is a word play on Albert Einstein's famous mass–energy equivalence formula and has been dubbed as the sequel and improved counterpart to "The Emancipation of Mimi". In his review of the album, Alex Macpherson from "The Guardian" described his thoughts on its title, as well as its meaning: It is worth pondering what the title of Mariah Carey's