Here, some fixed point theorems in partially ordered spaces are proved. As an application, the existence of a solution integral equation is obtained.

We prove that there exists a functorial correspondence between MV-algebras and partially cyclically ordered groups which are the wound-rounds of lattice-ordered groups. It follows some results about can be stated in terms MV-algebras. For example, study together with cyclic order allows to get first-order characterization unimodular complex numbers finite deduce pseudofinite MV-chains pseudo-si...