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Seminars Week 2001-08-20

		WEEK OF: Aug. 20


4:00 pm	Ellis B. Stouffer Colloquium, 306 Snow
		***Refreshments will be served in 406 Snow at 3:30 pm***

		Prof. Volker Mehrmann                      
		Inst. f. Mathematik, TU Berlin, Germany           

In this paper we study large scale quadratic eigenvalue problems
arising in  the numerical simulation (via finite element methods) of
the elastic deformation of anisotropic materials.

We discuss the computation of the eigenvalues and eigenvectors
closest to the imaginary axis which is the interior of the spectrum.
The numerical methods is constructed to reflect as much as possible
the structure (here an eigenvalue symmetry) of the physical problem. 
To do this we use an implicitely restarted 
shift-and-invert Arnoldi approach with a rational function 
that inherits the structure of the problem.

We present some numerical examples that prove the superiority
of the new structured approach over classical unstructured
methods and we  show how the same procedure can be used
in the context of slightly damped gyroscopic systems.

Events Calendar

Using Math

CTE course transformation grant helps Emily Witt, assistant professor of math, develop active learning with student groups in calculus.  Positive results using modules developed with Justin Lyle and Amanda Wilkens, math graduate students, were attained.  Read more

Math and COVID-19: Sources on how math is being used to track the virus and its spread.  AMS link.

A mathematician-musician's breakthrough melds East, West. Read more.

Researcher's innovative approach to flood mapping support emergency management and water officials. Read more.

Nicole Johnson found a way to express her baton twirling using math. See video.