different between eigenvalue vs positone
eigenvalue
English
Etymology
eigen- +? value, a partial calque of German Eigenwert.
Pronunciation
- enPR: ??g?n'v?lyo?o, IPA(key): /?a???n?vælju?/
Noun
eigenvalue (plural eigenvalues)
- (linear algebra) A scalar, , such that there exists a non-zero vector (a corresponding eigenvector) for which the image of under a given linear operator is equal to the image of under multiplication by ; i.e. .
- 1972, F. V. Atkinson, Multiparameter Eigenvalue Problems, Volume I: Matrices and Compact Operators, Academic Press, page x,
- In the extension, one associates eigenvalues, sets of scalars, with arrays of matrices by considering the singularity of linear combinations of the matrices in the various rows, involving the same coefficients in each case. Attention to this area was called in the early l920's by R. D. Carmichael, who pointed out in addition the enormous variety of mixed eigenvalue problems with several parameters.
- 2000, Hinne Hettema (translator), J. Von Neumann, E. Wigner, On the Behaviour of Eigenvalues in Adiabatic Processes [1929], Hinne Hettema (editor), Quantum Chemistry: Classic Scientific Papers, World Scientific, page 25,
- For many quantum-mechanical problems it is important to investigate the change of eigenvalues and eigenfunctions with the continuous change of one or more parameters. The case in which one knows the eigenvalues and eigenfunctions for two special values of the parameters, and is interested in the region in between is particularly interesting.
- 2005, Leonid D. Akulenko, Sergei V. Nesterov, High-Precision Methods in Eigenvalue Problems and Their Applications, CRC Press (Chapman & Hall), page 1,
- Problems that require an investigation of eigenvalues and eigenfunctions arise in connection with numerous topics in mechanics, the theory of vibrations and stability, hydrodynamics, elasticity, acoustics, electrodynamics, quantum mechanics, etc.
- 1972, F. V. Atkinson, Multiparameter Eigenvalue Problems, Volume I: Matrices and Compact Operators, Academic Press, page x,
Usage notes
When unqualified, as in the above example, eigenvalue conventionally refers to a right eigenvalue, characterised by for some right eigenvector . Left eigenvalues, characterised by also exist with associated left eigenvectors . (In consequence of the equations, left eigenvectors are row vectors, while right eigenvectors are column vectors.) The convention of right eigenvector as "standard" is fundamentally an arbitrary choice.
Synonyms
- (scalar multiplier of an eigenvector): characteristic root, characteristic value, eigenroot, latent value, proper value
Translations
See also
- eigenbasis
- eigendecomposition, eigen decomposition
- eigenface
- eigenfunction
- eigenmode
- eigenstate
- eigensystem
- eigenvector
Further reading
- Eigenvalues and eigenvectors on Wikipedia.Wikipedia
- Transformation matrix on Wikipedia.Wikipedia
- Eigenvalue on MathWorld.
- Eigen value on Encyclopedia of Mathematics.
eigenvalue From the web:
- what eigenvalues tell you
- what eigenvalues
- what eigenvalues represent
- what eigenvalues and eigenvectors
- what eigenvalues tell us
- eigenvalues what are they
- eigenvalue what does it mean
- eigenvalue what is it used for
positone
English
Etymology
Blend of positive +? monotone
Adjective
positone (not comparable)
- (mathematics) of a particular kind of eigenvalue problem involving a nonlinear function on the reals that is continuous, positive, and monotone.
- 2004, Leszek Gasinski, Nikolaos S. Papageorgiou, Nonsmooth Critical Point Theory and Nonlinear Boundary Value Problems, CRC Press, 2004 ?ISBN, page 704
- Finally, we mention that several papers studied nonlinear eigenvalue problems of the form
- for under the assumption that is continuous, positive, monotone. For this reason such problems were named positone... If the nonlinearity is continuous, monotone and ,...then the eigenvalue problem is called semipositone...
- Finally, we mention that several papers studied nonlinear eigenvalue problems of the form
- 2004, Leszek Gasinski, Nikolaos S. Papageorgiou, Nonsmooth Critical Point Theory and Nonlinear Boundary Value Problems, CRC Press, 2004 ?ISBN, page 704
Derived terms
- semipositone
Italian
Noun
positone m (plural positoni)
- Alternative form of positrone
positone From the web:
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