:: * No one is saying "invariance" means "relativity". For example, Galilean invariance contradicts relativity. However, a special type of invariance, Lorentz invariance, is fundamental to both special and general relativity (it holds locally in general relativity). String theory is Lorentz invariant. | :: * No one is saying "invariance" means "relativity". For example, Galilean invariance contradicts relativity. However, a special type of invariance, Lorentz invariance, is fundamental to both special and general relativity (it holds locally in general relativity). String theory is Lorentz invariant. |