Abstract:
Necessary conditions of $\varepsilon$-controllability for the class of degenerate linear differential equations in Banach space with respect to the time derivative and with the radially bounded operator on the right side are obtained. The results are effectively applied to the research of $\varepsilon$-controllability of initial boundary-value problems for the non-classical equations of mathematical physics.
Keywords:controllability; semigroup of operators; equations of Sobolev type.
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