202
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SIAMNUM
2011
14 years 10 months ago
2011
Abstract. When studying the ε-pseudospectrum of a matrix, one is often interested in computing the extremal points having maximum real part or modulus. This is a crucial step, for...
184
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SIAMNUM
2011
14 years 10 months ago
2011
The Green function of the Poisson equation in two dimensions is not contained in the Sobolev space H1(Ω) such that finite element error estimates for the discretization of a prob...
193
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SIAMMAX
2011
14 years 10 months ago
2011
This paper studies existence and uniqueness results and interlacing properties of nonlinear modifications of small rank of symmetric eigenvalue problems. Approximation properties ...
179
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SIAMMAX
2011
14 years 10 months ago
2011
A sufficient condition for the convexity of a finite product of positive definite quadratic forms is given in terms of the condition numbers of the underlying matrices. When only...
278
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SIAMMAX
2011
14 years 10 months ago
2011
We investigate an acceleration technique for restarted Krylov subspace methods for computing the action of a function of a large sparse matrix on a vector. Its effect is to ultima...