This article presents some properties of the casisupermodular function and demonstrates principles of discarding to solve the problem of minimization and maximization of this type of function defined in the family of subsets of a given finite set (finite boolean lattice); these principles are generalized, in the case of minimization, to a relatively complemented finite lattice. This work extends some results obtained by V.R. Khachaturov and R.V. Khachaturov for the case of supermodular functions.

This article presents some properties of the casisupermodular function and demonstrates principles of discarding to solve the problem of minimization and maximization of this type of function defined in the family of subsets of a given finite set (finite boolean lattice); these principles are generalized, in the case of minimization, to a relatively complemented finite lattice. This work extends some results obtained by V.R. Khachaturov and R.V. Khachaturov for the case of supermodular functions.

In the present work, necessary and sufficient optimality conditions are presented for the solution to a mínimum time problem. These conditions are established by the principle of the Pontryagin maximum, as a necessary and sufficient condition. In addition, the principle of the Pontryagin maximum is used in the search for the solution to an optimal control problem of mechanical origin.