MAGIC061: Functional Analysis

Course details

A core MAGIC course


Autumn 2017
Monday, October 9th to Friday, December 15th


Live lecture hours
Recorded lecture hours
Total advised study hours


10:05 - 10:55
10:05 - 10:55


This couse provides an introduction to analysis in infinite dimensions with a minimum of prerequisites. The core of the course concerns operators on a Hilbert space including the continuous functional calculus for bounded selfadjoint operators and the spectral theorm for compact normal operators. There will be an emphasis on positivity and on matrices of operators. The course includes some basic introductory material on Banach spaces and Banach algebras. It also includes some elementary (infinite dimensional) linear algebra that is usually excluded from undergraduate curricula. Here is a very brief list of the many further topics that this course anticipates. C*-algebras, von Neumann algebras and operator spaces (which may be viewed respectively as noncommutative topology, noncommutative measure theory and `quantised' functional analysis); Hilbert C*-modules; noncommutative probability (e.g. free probability), the theory of quantum computing, dilation theory; unbounded Hilbert space operators, one-parameter semigroups and Schrodinger operators. And that is without starting to mention Applied Maths, Engineering and Statistics applications ...
Some relevant books. (See the Bibliography page for more details of these books.)
G. K. Pederson, Analysis Now (Springer, 1988)
[This course may be viewed as a preparation for studying this text (which is already a classic).]
Simmonds, Introduction to Topology and Modern Analysis (McGraw-Hill, 1963)
[Covers far more than the course, but is still distinguished by its great accessibility.]
P.R. Halmos, Hilbert Space Problem Book (Springer, 1982)
[Collected and developed by a master expositor.]
There are many many other books which cover the core part of this course.


Standard undergraduate linear algebra and real and complex analysis, and basic metric space/norm topology.


Linear Algebra.
Including quotient space and free vector space constructions, diagonalisation of hermitian matrices, algebras, homomorphisms and ideals, group of units and spectrum.
Metric Space.
Review of basic properties, including completeness and extension of uniformly continuous functions.
General Topology.
Including compactness and Polish spaces.
Banach Space.
Including dual spaces, bounded operators, bidual [and weak*-topology], completion and continuous (linear) extension.
Banach Algebra.
Including Neumann series, continuity of inversion, spectrum, C*-algebra definition.
Hilbert Space Geometry.
Including Bessel's inequality, dimension, orthogonal complementation, nearest point projection for nonempty closed convex sets.
Stone-Weierstrass Approximation Theorem.
Sesquilinearity, orthogonal projection; Riesz-Frechet Theorem, adjoint operators, C*-property; Kernel-adjoint-range relation.
Finite rank operators; Operator types: normal, unitary, selfadjoint, isometric, compact, invertible, nonnegative, uniformly positive and partially isometric; Fourier transform as unitary operator; Invertibility criteria; Key examples of operators, finding their spectra (shifts and multiplication operators), norm and spectrum for a selfadjoint operator; Polar decomposition.
Continuous functional calculus for selfadjoint operators, with key examples: square-root and positive/negative parts; Matrices of operators, positivity in B(h+k);
Operator space - definition and simple examples;
Nonnegative-definite kernels, Kolmogorov decomposition; Hilbert space tensor products; Hilbert-Schmidt operators. Topologies on spaces of operators (WOT, SOT, uw). Compact and trace class operators, duality; Spectral Theorem for compact normal operators.
Nets and generalised sums.
Topological vector spaces.


  • ML

    Professor Martin Lindsay

    University of Lancaster


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The assessment for this course will be released on Monday 8th January 2018 and is due in by Sunday 21st January 2018 at 23:59.

Assessment for FUN by MAGIC (MAGIC061).
Assessment for this course will be in the standard format for MAGIC, namely a take-home exam which will be available on the web from 00:00 on Monday 8th January 2018, with deadline 23:59 on Sunday 21st January 2018, for submission via the MAGIC website.
The Exam will consist of a mixture of routine-type questions and more challenging ones. You are encouraged to attempt the hardest ones that you can, but it will be possible to pass the exam with clear and correct solutions to straightforward questions. Some of the harder ones might need some mulling over ...
The best preparation for the Exam is to regularly do the Exercises given. It would be good to do some every week, attempting the hardest that you can.
Feedback, along with model solutions, will be distributed individually.
Good luck, in advance.
Martin Lindsay

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