Ruth F. Curtain (born Melbourne, Australia, 1941) completed her early academic education (B.Sc. (Hons) 1962, Dip.Ed. 1963, M.A. Mathematics 1965) at the University of Melbourne and a Ph.D. in Applied Mathematics at Brown University, Providence, R.I., USA in 1969. She was Assistant Professor at Purdue University from 1970 to 1971 and spent 1971 to 1977 at the Control Theory Centre, University of Warwick, UK. At present she is emeritus professor in the mathematics department of the University of Groningen where she has worked since 1977. Her research interests lie in the area of infinite-dimensional systems theory. She is the co-author of two books in this field: “Infinite Dimensional Systems Theory”, LNCIS, volume 8, Springer Verlag, 1978, with A.J. Pritchard, and ”An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with H.J. Zwart. She has served as associate editor for the international journals Systems and Control Letters, Automatica, the journal Mathematics of Control, Signals and Systems and the Journal of Mathematical Systems, Estimation and Control and as an editor for Automatica. For contributions to the control theory of stochastic systems and infinite-dimensional systems she was elected to the grade of Fellow in the IEEE in 1991.Hans Zwart (born Hoogezand-Sappemeer, The Netherlands, 1959) received his Masters degree in mathematics in 1984 and his Ph.D. in 1988 at the University of Groningen. Since 1988 he is with the Department of Applied Mathematics, University of Twente, the Netherlands, where he is now full professor. His research interest lies in the area of distributed parameter systems. In addition, he holds a part-time professorial position at the department of Mechanical Engineering, Eindhoven University of Technology. He is the co-author of many papers and of the text books “An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with R.F. Curtain and of “Linear Port-Hamiltonian Systems on Infinite-Dimensional Spaces” with B. Jacob. Current research topics include system theory for distributed parameter systems with a Hamiltonian dynamics and controller design for mechanical systems.

• Introduction.- Semigroup Theory.- Classes of Semigroups.- Stability.- The Cauchy Problem.- State Linear Systems.- Input-Output Maps.- Stabilizability and Detectability.- Linear Quadratic Optimal Control.- Boundary Control Systems.- Existence and Stability for Semilinear Differential Equations.- Appendix.

Ruth F. Curtain (born Melbourne, Australia, 1941) completed her early academic education (B.Sc. (Hons) 1962, Dip.Ed. 1963, M.A. Mathematics 1965) at the University of Melbourne and a Ph.D. in Applied Mathematics at Brown University, Providence, R.I., USA in 1969. She was Assistant Professor at Purdue University from 1970 to 1971 and spent 1971 to 1977 at the Control Theory Centre, University of Warwick, UK. At present she is emeritus professor in the mathematics department of the University of Groningen where she has worked since 1977. Her research interests lie in the area of infinite-dimensional systems theory. She is the co-author of two books in this field: “Infinite Dimensional Systems Theory”, LNCIS, volume 8, Springer Verlag, 1978, with A.J. Pritchard, and ”An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with H.J. Zwart. She has served as associate editor for the international journals Systems and Control Letters, Automatica, the journal Mathematics of Control, Signals and Systems and the Journal of Mathematical Systems, Estimation and Control and as an editor for Automatica. For contributions to the control theory of stochastic systems and infinite-dimensional systems she was elected to the grade of Fellow in the IEEE in 1991.Hans Zwart (born Hoogezand-Sappemeer, The Netherlands, 1959) received his Masters degree in mathematics in 1984 and his Ph.D. in 1988 at the University of Groningen. Since 1988 he is with the Department of Applied Mathematics, University of Twente, the Netherlands, where he is now full professor. His research interest lies in the area of distributed parameter systems. In addition, he holds a part-time professorial position at the department of Mechanical Engineering, Eindhoven University of Technology. He is the co-author of many papers and of the text books “An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with R.F. Curtain and of “Linear Port-Hamiltonian Systems on Infinite-Dimensional Spaces” with B. Jacob. Current research topics include system theory for distributed parameter systems with a Hamiltonian dynamics and controller design for mechanical systems.

• Introduction.- Semigroup Theory.- Classes of Semigroups.- Stability.- The Cauchy Problem.- State Linear Systems.- Input-Output Maps.- Stabilizability and Detectability.- Linear Quadratic Optimal Control.- Boundary Control Systems.- Existence and Stability for Semilinear Differential Equations.- Appendix.

Ruth F. Curtain (born Melbourne, Australia, 1941) completed her early academic education (B.Sc. (Hons) 1962, Dip.Ed. 1963, M.A. Mathematics 1965) at the University of Melbourne and a Ph.D. in Applied Mathematics at Brown University, Providence, R.I., USA in 1969. She was Assistant Professor at Purdue University from 1970 to 1971 and spent 1971 to 1977 at the Control Theory Centre, University of Warwick, UK. At present she is emeritus professor in the mathematics department of the University of Groningen where she has worked since 1977. Her research interests lie in the area of infinite-dimensional systems theory. She is the co-author of two books in this field: “Infinite Dimensional Systems Theory”, LNCIS, volume 8, Springer Verlag, 1978, with A.J. Pritchard, and ”An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with H.J. Zwart. She has served as associate editor for the international journals Systems and Control Letters, Automatica, the journal Mathematics of Control, Signals and Systems and the Journal of Mathematical Systems, Estimation and Control and as an editor for Automatica. For contributions to the control theory of stochastic systems and infinite-dimensional systems she was elected to the grade of Fellow in the IEEE in 1991.Hans Zwart (born Hoogezand-Sappemeer, The Netherlands, 1959) received his Masters degree in mathematics in 1984 and his Ph.D. in 1988 at the University of Groningen. Since 1988 he is with the Department of Applied Mathematics, University of Twente, the Netherlands, where he is now full professor. His research interest lies in the area of distributed parameter systems. In addition, he holds a part-time professorial position at the department of Mechanical Engineering, Eindhoven University of Technology. He is the co-author of many papers and of the text books “An Introduction to Linear Infinite-Dimensional System Theory”, Springer Verlag, 1995, with R.F. Curtain and of “Linear Port-Hamiltonian Systems on Infinite-Dimensional Spaces” with B. Jacob. Current research topics include system theory for distributed parameter systems with a Hamiltonian dynamics and controller design for mechanical systems.

• Introduction.- Semigroup Theory.- Classes of Semigroups.- Stability.- The Cauchy Problem.- State Linear Systems.- Input-Output Maps.- Stabilizability and Detectability.- Linear Quadratic Optimal Control.- Boundary Control Systems.- Existence and Stability for Semilinear Differential Equations.- Appendix.