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The aim of this course is to give a very modest introduction to the extremely rich and well-developed theory of Hilbert spaces, an introduction that hopefully will provide the students with a knowledge of some of the fundamental results of the theory and will make them familiar with everything needed in order to understand, believe and apply the spectral theorem for self adjoint operators in Hilbert space. This implies that the course will have to give answers to such questions asWhat is a Hilbert space?What is a bounded operator in Hilbert space?What is a self adjoint operator in Hilbert space?What is the spectrum of such an operator?What is meant by a spectral decomposition of such an operator?

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