  In this paper we consider the construction of K + M, where K is the domain, M
is the maximal ideal of a some ring of polynomials with coefficients from the
field L, where K is its subring. In addition to the usual domains, we also
consider the Noetherian, Prufer and GCD-domains. In particular, polynomial
composites are a case of K + M construction. In this paper we will find
numerous construction conclusions related to polynomial composites.
