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Your search keyword '"J. T. Marti"' showing total 23 results
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23 results on '"J. T. Marti"'

1. Buchbesprechungen

Author

R. Sperb, D. S. Lubinsky, M. Gutknecht, Bernhard Ruf, M. Struwe, H. R. Schwarz, H. R. Schneebeli, J. J. Burckhardt, J. T. Marti, and R. Seydel

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1988
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2. Buchbesprechungen

Author

Karin Reich, H. R. Schwarz, M. Gutknecht, J. T. Marti, R. Seydel, Dietrich Flockerzi, A. Blatter, Hp. Fässler, M. Śanchez, N. Straumann, I. L. Ryhming, P. Niederer, D. S. Lubinsky, F. H. Busse, and B. Aupoix

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1988
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3. Buchbesprechungen

Author

B. Thurnherr, Th. M. Liebling, M. Gutknecht, H. Kunz, Th. Eisele, J. Marti, J. T. Marti, B. Schneeberger, N. Wirth, M. -A. Knus, F. Troyon, E. Engeler, A. Friedli, and K. Meier

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1980
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4. Buchbesprechungen

Author

N. Rott, J. T. Marti, P. Schwendiman, Edgar Ascher, M. Jeger, H. H. Keller, A. Prodon, A. Gyr, and K. Hazeghi

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1979
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5. On the convergence of an algorithm computing minimum-norm solutions of ill-posed problems

Author

J. T. Marti

Subjects
Well-posed problem, Algebra and Number Theory, Applied Mathematics, Hilbert space, Of the form, Fredholm integral equation, Fredholm theory, Bounded operator, Computational Mathematics, symbols.namesake, Norm (mathematics), symbols, Algorithm, Second derivative, Mathematics
Abstract

The paper studies a finite element algorithm giving approximations to the minimum-norm solution of ill-posed problems of the form A f = g Af = g , where A is a bounded linear operator from one Hubert space to another. It is shown that the algorithm is norm convergent in the general case and an error bound is derived for the case where g is in the range of A A ∗ A{A^\ast } . As an example, the method has been applied to the problem of evaluating the second derivative f of a function g numerically.

Published
1980
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6. Buchbesprechungen

Author

W. L�thy, M. R. Trummer, Klaus Affolter, F. Weinberg, A. Pochelon, R. Pozzorini, E. Huber, Res Jost, J. T. Marti, J. Marti, F. Troyon, S. J. Hogan, Z. Plaskowski, H. R. Schwarz, and F. Fankhauser

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1984
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7. Buchbesprechungen

Author

W. Furrer, Hans Ziegler, H. Baggenstos, R. Jost, J. T. Marti, W. Baltensperger, Mahir Sayir, and Carlo Cercignani

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1977
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8. Buchbesprechungen

Author

Theo Tschudi, J. T. Marti, Peter Hählen, Christian Blatter, H. Leutwyler, A. Piaget, Iris Zschokke-Gränacher, F. Troyon, Klaus Hepp, and Albert Fässler

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1980
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9. Buchbesprechungen

Author

Luciano Molinari, J. T. Marti, E. Handschin, Mahir Sayir, E. S. Weibel, W. Furrer, W. Traupel, I. Zschokke-Gränächer, and K. Alder

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1974
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10. An Algorithm for Computing Minimum Norm Solutions of Fredholm Integral Equations of the First Kind

Author

J. T. Marti

Subjects
Numerical Analysis, Collocation, Applied Mathematics, Computation, Mathematical analysis, Fredholm integral equation, Fredholm theory, Integral equation, Interpretation (model theory), Computational Mathematics, symbols.namesake, Convergence (routing), symbols, Algorithm, Subspace topology, Mathematics
Abstract

An algorithm is developed for the numerical computation of minimum norm solutions of Fredholm integral equations of the first kind $Kf = g$. The algorithm is different from Tihonov’s method and avoids direct collocation. The method has the following geometrical interpretation: One is looking for a vector of minimum norm that lies in a given finite dimensional subspace and also in a given neighborhood of the set of all solutions of $Kf = g$. A convergence proof for the algorithm is presented and four examples are treated numerically.

Published
1978
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11. Buchbesprechungen

Author

Martin Gutkneckt, J. T. Marti, J�rgen Scheurle, J. R. Baron, Peter J. Braam, N. Straumann, K. Hutter, H. R. Schneebeli, H. R. Schwarz, R. Seydel, H. Walser, and J. J. Keller

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1989
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12. Evaluation of the Least Constant in Sobolev’s Inequality for $H^1 (0,s)$

Author

J. T. Marti

Subjects
Discrete mathematics, Sobolev space, Numerical Analysis, Computational Mathematics, Exact solutions in general relativity, Applied Mathematics, Bounded function, Hyperbolic function, Interval (mathematics), Function (mathematics), Space (mathematics), Constant (mathematics), Mathematics
Abstract

Variational methods are applied to evaluate the least constant c in Sobolev’s inequality for the imbedding of the Sobolev space $H^1 (0,s)$, where $(0,s)$ is a real interval, into the space $C(0,s)$ of bounded continuous functions on $(0,s)$. The method yields the exact solution explicitly. It is shown that $c = \tanh ^{ - {1 / 2}} (s)( \cong 1.1459{\text{ for }}s = 1)$ and that equality holds for the hyperbolic cosine function.

Published
1983
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13. Buchbesprechungen

Author

M. Sayir, Ch. Wehrli, J. T. Marti, K. Alder, J. P. Clavadetscher, M. Jeger, Alfred Huber, W. Prager, P. Hirt, H. R. Schwarz, A. Piaget, Franz Rothe, and G. Mazzola

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1973
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14. Buchbesprechungen

Author

P. Henrici, K. Hepp, M. Gutknecht, Mahir Sayir, K. Magnus, W. Epprecht, J. T. Marti, H. J. Lüthi, and F. Lenz

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1971
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15. The Least Constant in Friedrichs’ Inequality in One Dimension

Author

J. T. Marti

Subjects
Sobolev space, Computational Mathematics, Simple (abstract algebra), Transcendental equation, Applied Mathematics, Mathematical analysis, Dimension (graph theory), Friedrichs' inequality, Constant (mathematics), Analysis, Mathematics
Abstract

Friedrichs’ inequality for the Sobolev space $H^1 (0,s),s > 0$, is $\|f\|_1 \leq c(f(0)^2 + f(s)^2 + \|f'\|^2 )^{{1 / 2}} ,f \in H^1 (0,s)$, where $f'$ is the first derivative of f and $\| \cdot \|_1 $ and $\| \cdot \| $ are the norms of $H^1 (0,s)$ and $L_2 (0,s)$ respectively. The usual proofs for the existence of such a constant c are based on nonconstructive functional analytic ideas. It is shown that the least constants c can be evaluated by variational techniques and are given by the unique solution of a simple transcendental equation. In the special case $s=1$ one has, for example, $c = 1.07869 \cdots $.

Published
1985
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16. Buchbesprechungen

Author

Hans Ziegler, J. T. Marti, and Hans Jarchow

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1976
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17. Buchbesprechungen

Author

E. Batschelet, A. Piaget, Paul Bernays, P. Profos, G. Scharf, J. T. Marti, and Th Gasser

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1972
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18. Buchbesprechungen

Author

A. Piaget, Res Jost, W. Baltensperger, W. Traupel, J. Hersch, J. T. Marti, P. Minkowski, and I. Zschokke

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1973
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19. Buchbesprechungen

Author

R. Wagner, J. T. Marti, E. A. Roth, W. Hunziker, Kasra Hazeghi, I. Zschokke, and H. Weber

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1972
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20. Buchbesprechungen

Author

J. T. Marti, Hans Ziegler, H. -P. Tschanz, Beat Sigg, and I. Zschokke-Gränacher

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1975
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21. Buchbesprechungen

Author

J. T. Marti, E. Baumann, J. Nânni, W. Baltensperger, and Thomas M. Liebling

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1977
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22. Buchbesprechungen

Author

E. Batschelet, H. Thomann, J. T. Marti, H. Brauchli, and Hs. H. Günthard

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1975
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23. Buchbesprechungen

Author

J. T. Marti and H. R. Schwarz

Subjects
Applied Mathematics, General Mathematics, General Physics and Astronomy
Published
1972
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