A memorial meeting to mark the life and work of
Professor W.N. Everitt

This meeting, to be held on the 15-17 May, 2014, is a memorial to Norrie Everitt FRSE, a distinguished expert in the field of spectral analysis and differential equations who died on 17 July, 2011 aged 87.

Norrie was a widely acknowledged authority on the spectral theory of differential equations, and inequalities. He made many significant contributions to such topics as the Titchmarsh-Weyl m-function, the deficiency index problem, periodic problems, and the numerical computation of eigenvalues of Sturm-Liouville problems.

The meeting will focus on the following topics:

  • ordinary differential equations: selfadjoint and non-selfadjoint Sturm-Liouville operators, inverse problems;
  • systems of differential equations: Dirac operators and other block operator matrices;
  • non-linear differential equations;
  • periodic differential operators and the structure of their spectrum.


Thursday 15 May

10.00 W.D. Evans (Cardiff, UK): The HELP inequality revisited
11.00 Coffee
11.30 B.M. Brown (Cardiff, UK): Descendants of Everitt’s HELP inequality
12.30 Lunch
14.00 I. Wood (Kent, UK): Abstract M-functions and their relation to the spectrum
15.00 C. Tretter (Berne, Switzerland) Spectral inclusion for non-selfadjoint operators
16.00 Coffee
16.30 M. Marletta (Cardiff, UK): On the stability of a forward-backward heat equation
17:30 Break
18:30 T Everitt: 'Norrie’s life'
...followed by a wine reception.

Friday 16 May

10.00 H. Langer (Vienna, Austria): Generalized Nevanlinna functions as m-functions
11.00 Coffee
11.30 M. Plum (Karlsruhe, Germany): A computer-assisted multiplicity proof for a semilinear elliptical boundary value problem
12.30 Lunch
14:00 C. Bennewitz (Lund, Sweden): The spectral problem for the zero dispersion Camassa-Holm Equation
15:00 A. Pushnitski (King’s College London, UK): An inverse spectral problem for Hankel operators
16:00 Coffee
16:30 T. Johansson (Linkoping, Sweden): Inverse acoustic multiple obstacle scattering using topological derivatives

20:00 Conference Dinner (Casanova, Cardiff)

Saturday 17 May

10.00 A. Shkalikov (Moscow State University, Russia): Ordinary differential operators with singular coefficients
11.00 Coffee
11.30 L. Littlejohn (Baylor, Texas, USA): The spectral theory of some exceptional orthogonal polynomials
12.30 Lunch
13:30 K.M. Schmidt (Cardiff, UK): Spectral properties of massless Dirac operators
14:30 H. Kalf (Munich, Germany): Nonexistence of zero modes of the massless Dirac operator
15:30 End of meeting

  • The meeting will be held at the School of Computer Science & Informatics at Cardiff University (Queens Buildings) in the West extension room WX/3.07 on 15 May 2014, commencing at 9:55am. The meeting will end at 16:00pm on the 17 May 2014.


    Registration is now closed.

  • Accommodation

    Please book a hotel well in advance. Cardiff is a tourist destination and hotels can fill up. Some Cardiff Hotels can be found at http://www.smoothhound.co.uk/cardiff.html


    The School of Computer Science and Informatics at Cardiff is at Queen's Buildings, 5 The Parade, Roath, Cardiff CF24 3AA, UK, 100m from Queen's Street railway station. It takes 20-25 minutes to walk to the School from Cardiff Central railway station.

    The meeting is generously supported by the London Mathematical Society and the Cardiff School of Mathematics.