In this paper, firstly, a notion of a class of generalized weighted pseudo almost periodic function is introduced, then we investigate some basic and essential properties of the space that consists of these functions. Finally, we study the existence of weighted pseudo almost periodic solutions to hematopoiesis model with time-varying delay.

This article is concerned with a system of semilinear parabolic equations with no-flux boundary condition in a mutualistic ecological model. Stability result of the equilibrium about relevant ODE problem is proved by discussing its Jacobian matrix, we give two priori estimates and prove that the model is permanent when $\varepsilon_1+\varepsilon_2\neq 0$. Moreover, sufficient conditions for the global asymptotical stability of the unique positive equilibrium of the model are obtained. Nonexistence of nonconstant positive steady states of the model is also given. When $\varepsilon_1+\varepsilon_2 = 0,$ grow up property is derived if the geometric mean of the interaction coefficients is greater than 1 ($\alpha_1\alpha_2 >1$), while if the geometric mean of the interaction coefficients is less than 1 ($\alpha_1\alpha_2<1$), there exists a global solution. Finally, numerical simulations are given.

Let $p(z)=a_0+a_1z+a_2z^2+a_3z^3+\cdots+a_nz^n$ be a polynomial of degree $n$. Rivlin [12] proved that if $p(z)\neq 0$ in the unit disk, then for $0< r\leq 1,$ $${\max_{|z|=r}|p(z)|}\geq \Big(\dfrac{r+1}{2}\Big)^n{\max_{|z|=1}|p(z)|}.$$ In this paper, we prove a sharpening and generalization of this result and show by means of examples that for some polynomials our result can significantly improve the bound obtained by the Rivlin's Theorem.

This paper deals with optimal control problems for a non-stationary Stokes system. We study a simultaneous distributed-boundary optimal control problem with distributed observation. We prove the existence and uniqueness of a simultaneous optimal control and we give the first order optimality condition for this problem. We also consider a distributed optimal control problem and a boundary optimal control problem and we obtain estimations between the simultaneous optimal control and the optimal controls of these last ones. Finally, some regularity results are presented.

Let $T_{1}$ be a singular integral with non-smooth kernel or $\pm I$, let $T_{2}$  and $T_{4}$ be the linear operators and  let $T_{3}=\pm I$. Denote the Toeplitz type operator by$$T^b=T_{1}M^bI_\alpha T_{2}+T_{3}I_\alpha M^b T_{4},$$where $M^bf=bf,$ and $I_\alpha$ is the fractional integral operator. In this paper, we investigate the boundedness of the operator $T^b$ on the weighted Morrey space when $b$ belongs to the weighted BMO space.

In an abstract set up, we get strong type inequalities in $L^{p+1}$ by assuming  weak or extra-weak inequalities in Orlicz spaces. For some classes of functions, the number $p$ is related to Simonenko indices. We apply the results to get strong inequalities for maximal functions associated to best $\Phi$-approximation operatorsin an Orlicz space $L^{\Phi}$.

In this paper, we consider a Lorentz space with a mixed norm of periodic functions of many variables. We obtain the exact estimation of the best $M$-term approximations of Nikol'skii's and Besov's classes in the Lorentz space with the mixed norm.

Let $\mathbb{D}$ be the open unit disk in the complex plane $\mathbb{C}$. For $\alpha>-1$, let $dA_{\alpha}(z)= (1+\alpha)\left(1-|z|^2\right)^{\alpha}dA(z)$ be the weighted Lebesgue measure on $\mathbb{D}$. For a positive function $\omega\in L^1(\mathbb{D}, dA_{\alpha})$, the generalized weighted Bergman-Orlicz space $\mathcal{A}_{\omega}^{\psi}(\mathbb{D}, dA_{\alpha})$ is the space of all analytic functions such that $$\|f\|_{\omega}^{\psi}=\int_{\mathbb{D}} \psi(|f(z)|) \omega(z) dA_{\alpha}(z) <\infty,$$ where $\psi$ is a strictly convex Orlicz function that satisfies other technical hypotheses. Let $G$ be a measurable subset of $\mathbb{D}$, we say $G$ satisfies the reverse Carleson condition for $\mathcal{A}_{\omega}^{\psi}(\mathbb{D}, dA_{\alpha})$ if there exists a positive constant $C$ such that$$\int_{G} \psi(|f(z)|) \omega(z) dA_{\alpha}(z) \geq C \int_{\mathbb{D}} \psi(|f(z)|) \omega(z) dA_{\alpha}(z),$$for all $f\in \mathcal{A}_{\omega}^{\psi}(\mathbb{D}, dA_{\alpha})$. Let $\mu$ be a positive Borel measure, we say $\mu$ satisfies the direct Carleson condition if there exists a positive constant $M$ such that for all $f\in \mathcal{A}_{\omega}^{\psi}(\mathbb{D}, dA_{\alpha})$,$$\int_{\mathbb{D}} \psi(|f(z)|) d\mu(z) \leq M \int_{\mathbb{D}} \psi(|f(z)|) \omega(z) dA_{\alpha}(z).$$ In this paper, we study the direct and reverse Carleson condition on the generalized weighted Bergman-Orlicz space $\mathcal{A}_{\omega}^{\psi}(\mathbb{D}, dA_{\alpha})$. We present conditions on the set $G$ such that the reverse Carleson condition holds. Moreover, we  give a sufficient condition for the finite positive Borel measure $\mu$ to satisfy the direct carleson condition on the generalized weighted Bergman-Orlicz spaces.