We build spaces of q.p. (quasi-periodic) functions and we establich some of their properties. They are motivated by the Perceival approach to q.p. solutions of Hamiltonian systems. The periodic solutions of an adequat Partial Differential Equation are related to the q.p. solutions of an Ordinar...

For a given finite poset (P,-<), we construct strict completions of P which are models of all finite lattices L such that the set of join-irreducible elements of L is isomorphic to P.