**Seminar on
Applied Mathematics**

**PROGRAM**

Matematicki fakultet

Fakultet organizacionih nauka

JUPIM

MI SANU, Knez Mihailova 35, biblioteka

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Utorak, 3.6.2003. u 14:15, Sala 61, ETF:
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Peter Rowlinson, University of Stirling, Stirling, Scotland, U.K.
THE MULTIPLICITY OF GRAPH EIGENVALUES
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Abstract:
We show how star complements can be used to determine a sharp upper
bound for the multiplicity of a graph eigenvalue other than -1 or 0.
The result is an analogue for arbitrary graphs of the so-called
absolute bound for strongly regular graphs. We establish a similar
bound for regular graphs; in this case, the graphs for which the bound
is attained are precisely the extremal strongly regular graphs.
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Utorak, 10.6.2003. u 14:15, SALA 201, FON:
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Vladimir Bukvic, Vojna Akademija, Beograd
SIMULACIONO MODELIRANJE ORGANIZACIONE STRUKTURE HIJERARHIJSKOG
VISENIVOJSKOG LOGISTICKOG SISTEMA
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(zajednicki sastanak sa Seminarom Katedre za matematiku, kibernetiku
i informacione sisteme FON-a)
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OBAVESTENJE:

Utorak, 3.6.2003. u 11h, biblioteka MI SANU :
Adelina Georgescu, predsednica rumunskog udruzenja za industrisku i
primenjenu matematiku (ROMAI), Faculty of Mathematics and Computer
Sciences University of Pitesti, Romania

METHODS BASED ON FOURIER SERIES IN HYDROMAGNETIC STABILITY THEORY

Abstract:
In linear stability of fluid flows and equilibria subject to several
effects (e.g. temperature, concentration, magnetic field) the governing
ordinary differential equations are of high order (usually more than 10)
and contain several (usually more than three) parameters. In addition,
the equations are not selfadjoint and the corresponding eigenvalues are
not simple. Finally, the boundary conditions are quite complicate. As a
consequence the Fourier series expansion methods of Galerkin type based
on total sets of expansion functions satisfaying all boundary conditions
are no longer appropriate. This is why we used Budiansky--DiPrima method
in which the expansion functions do not satisfy all boundary conditions,
thus introducing some constraints. We reveal the main steps in its
application to magnetic convections. We also show the advantages and the
peculiarities of this method if applied to the associated variational
setting.

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RUKOVODIOCI SEMINARA
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Vera Kovacevic-Vujcic
Milan Drazic
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