Observation and control for operator semigroups

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Book is to large extent self-contained Attempts to unify two approaches traditionally different, one using essentially abstract functional analysis and the other based on techniques coming from partial differential equations Main exact observability results are obtained by combining functional analysis with various methods such as multipliers, Ingham-Beurling-type inequalities and Carleman estimates Elliptic and the parabolic Carleman-type estimates used in this book are worked out in detail, with an elementary construction of the necessary weight function Includes supplementary material: sn. pub/extras