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Sums of Laplace eigenvalues - rotationally symmetric maximizers in the plane
Isoperimetric membrane tight frame
2010/12/14
The sum of the first n 1 eigenvalues of the Laplacian is shown to be maximal among triangles for the equilateral triangle,maximal among parallelograms for the square, and maximal among ellipses for ...
RQI is an approach for eigenvectors of matrices. In 1974, B.N Parlett
proved that it was a ``succeessful algorithm'' with cubic convergent
speed for normal matrices. After then, several authors deve...