Directory UMM :Journals:Journal_of_mathematics:EJQTDE:
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This paper deals with the existence and uniqueness of the weak periodic solution for a model of transport of a pollutant flow in a porous medium.. Our model is described by means of
In order to model intuitionistic systems without additive connectives, elementary linear non-linear models and light linear non-linear models can be weakened by only requiring C to be
The third section contains the formulations of the main theorems of the paper, concerning the existence and uniqueness of solutions of the problems discussed in the first section,
Section 2 summarizes the main results on properties A and B for linear equations proved in [6] and section 3 is devoted to nonlinear case: some comparison theorems are
We will first give a simple criterion of non-existence of Laurent polynomial first integral for general analytic systems... of differential equations in
In section 2 we extend these results to categories with a coherent ring structure which we call lax G -ring categories.The main coherence result here, Theorem 2.5, implies that
By arguments of De Vylder and Goovaerts (1999, Section 6) the validity of results in the classical model can often be extended to any homogeneous model.. By the discussion at the end
A first class involves all the mechanical models with Coulomb’s friction, and a second one involves all the other models: this last class contains all the models with a friction
