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Integral inequalities and mild solutions of semilinear neutral evolution equations. (English) Zbl 1074.34059
The paper is mainly concerned with the existence of mild solutions for a nonlocal Cauchy problem governed by a semilinear neutral differential equation in a Banach space $$X$$ $\frac{d}{dt}[x(t)+g(t,x(t))]= Ax(t)+f(t,x(t)), \quad x(0)=x_0-h(x(t)), \quad t\in [0,T]$ where $$A$$ is the infinitesimal generator of a strongly continuous semigroup of bounded linear operators; $$g,f:[0,T]\times X\to X$$ and $$h:C([0,T],X)\to X$$ are given functions.
In order to prove the existence theorem, the authors provide new results on a singular nonlinear integral inequality of Bihari type $u(t)\leq l(t)+\int_0^t \frac{1}{(t-s)^{1-\beta}}\alpha_1(s)\omega_1(u(s))\, ds + \int_0^t \alpha_2(s)\omega_2(u(s))\, ds\;.$
Finally, they give an application to partial differential equations.

##### MSC:
 34G20 Nonlinear differential equations in abstract spaces 34K30 Functional-differential equations in abstract spaces 34K40 Neutral functional-differential equations 26D10 Inequalities involving derivatives and differential and integral operators
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##### References:
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