%0 Journal Article %T First Order Optimum Calculi %A A. Borowiec %A V. K. Kharchenko %J Mathematics %D 1995 %I arXiv %X A new notion of an optimum first order calculi was introduced in [Borowiec, Kharchenko and Oziewicz, 1993]. A module of vector fields for a coordinate differential is defined. Some examples of optimal algebras for homogeneous bimodule commutations are presented. Classification theorem for homogeneous calculi with commutative optimal algebras in two variables is proved. %U http://arxiv.org/abs/q-alg/9501024v2