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# Article

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Keywords:
linear functional differential equation; antiperiodic type BVP; solvability and unique solvability
Summary:
Nonimprovable, in a certain sense, sufficient conditions for the unique solvability of the boundary value problem $u^{\prime }(t)=\ell (u)(t)+q(t),\qquad u(a)+\lambda u(b)=c$ are established, where $\ell :C([a,b];R)\rightarrow L([a,b];R)$ is a linear bounded operator, $q\in L([a,b];R)$, $\lambda \in R_+$, and $c\in R$. The question on the dimension of the solution space of the homogeneous problem $u^{\prime }(t)=\ell (u)(t),\qquad u(a)+\lambda u(b)=0$ is discussed as well.
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