In mathematical notation, this is:
Note: symmetry is not the exact opposite of antisymmetry (aRb and bRa implies b = a). There are relations which are both symmetric and antisymmetric (equality and its subrelations, including, vacuously, the empty relation), there are relations which are neither symmetric nor antisymmetric (divisibility), there are relations which are symmetric and not antisymmetric (congruence modulo n), and there are relations which are not symmetric but are antisymmetric ("is less than or equal to").
US Patent Issued to Nintendo on July 23 for "Storage Medium, Game Apparatus, Game System and Game Controlling Method" (Japanese Inventors)
Jul 23, 2013; ALEXANDRIA, Va., July 23 -- United States Patent no. 8,491,383, issued on July 23, was assigned to Nintendo Co. Ltd. (Kyoto,...