In probability theory, an isotropic measure on\\ mathbb ^ is a Borel measure that is absolutely continuous on\\ mathbb ^\\ backslash\\ and is invariant under linear isometries of\\ mathbb ^.
In probability theory, an isotropic measure is any mathematical measure that is invariant under linear isometries. An isotropic measure on\\ mathbb ^ is a (Borel) measure that is absolutely continuous on\\ mathbb ^\\ backslash\\ and that is invariant under linear isometries of\\ mathbb ^.