%0 Journal Article %A Luis Aina, Alfredo %T Complementarity and certainty relations for two-dimensional systems %D 2001 %@ 1050-2947 %U https://hdl.handle.net/20.500.14352/59681 %X Very simple duality relations-assessing complementarity for two-dimensional systems are obtained by introducing a measure of fluctuations derived from dispersion. These relations fully explain the enforcement of complementarity in situations in which the standard position-momentum uncertainty relation plays no role. %~