Results 1 to 10 of about 3,690 (92)

Twistor space, Minkowski space and the conformal group [PDF]

, 1983
It is shown that the conformal group of compactified Minkowski space is isomorphic to a group of rays of semilinear transformations of twistor space.
Broek, P.M. van den
core   +3 more sources

Semifields from skew polynomial rings [PDF]

, 2012
Skew polynomial rings were used to construct finite semifields by Petit in 1966, following from a construction of Ore and Jacobson of associative division algebras.
Lavrauw, Michel, Sheekey, John
core   +4 more sources

Cycles of linear and semilinear mappings

, 2012
We give a canonical form of matrices of a cycle of linear or semilinear mapping V_1 --- V_2 --- ... --- V_t --- V_1 in which all V_i are complex vector spaces, each line is an arrow ---> or
Bass, Debora Duarte de Oliveira, Djoković, Dmitry Kovalenko, Dobrovol’skaya, Gabriel, Gabriel, Haantjes, Hong, Horn, Horn, Kronecker, Nazarova, Sergeichuk, Tatiana Klimchuk, Vladimir V. Sergeichuk, Vyacheslav Futorny   +16 more
core   +1 more source

Computing downward closures for stacked counter automata [PDF]

, 2014
The downward closure of a language $L$ of words is the set of all (not necessarily contiguous) subwords of members of $L$. It is well known that the downward closure of any language is regular.
Zetzsche, Georg
core   +2 more sources

Automorphism groups of Grassmann codes

, 2013
We use a theorem of Chow (1949) on line-preserving bijections of Grassmannians to determine the automorphism group of Grassmann codes. Further, we analyze the automorphisms of the big cell of a Grassmannian and then use it to settle an open question of ...
Artin, Beelen, Beelen, Berger, Bogart, Chow, Ghorpade, Ghorpade, Griffiths, Harris, Hirschfeld, Hodge, Krishna V. Kaipa, Lakshmibai, MacWilliams, Nemitz, Nogin, Pankov, Prażmowski, Sudhir R. Ghorpade, Tsfasman, Tsfasman, Wan, Ward, Westwick   +24 more
core   +2 more sources

Regular Objects, Multiplicative Unitaries and Conjugation

, 2002
The notion of left (resp. right) regular object of a tensor C*-category equipped with a faithful tensor functor into the category of Hilbert spaces is introduced. If such a category has a left (resp.
Pinzari, Claudia, Roberts, John E.
core   +1 more source

Consimilarity and quaternion matrix equations $AX-\hat{X}B=C$, $X-A\hat{X}B=C$

, 2014
L.Huang [Linear Algebra Appl. 331 (2001) 21-30] gave a canonical form of a quaternion matrix $A$ with respect to consimilarity transformations $\tilde{S}^{-1}AS$ in which $S$ is a nonsingular quaternion matrix and $\tilde{h}:=a-bi+cj-dk$ for each ...
Klimchuk, Tatiana, Sergeichuk, Vladimir V.   +1 more
core   +2 more sources

Two combined methods for the global solution of implicit semilinear differential equations with the use of spectral projectors and Taylor expansions

, 2019
Two combined numerical methods for solving semilinear differential-algebraic equations (DAEs) are obtained and their convergence is proved. The comparative analysis of these methods is carried out and conclusions about the effectiveness of their ...
Filipkovska, M. S.
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A Centre-Stable Manifold for the Focussing Cubic NLS in $R^{1+3}$ [PDF]

, 2007
Consider the focussing cubic nonlinear Schr\"odinger equation in $R^3$: $$ i\psi_t+\Delta\psi = -|\psi|^2 \psi. $$ It admits special solutions of the form $e^{it\alpha}\phi$, where $\phi$ is a Schwartz function and a positive ($\phi>0$) solution of ...
A. Soffer, A. Soffer, C. Kenig, C.A. Pillet, C.V. Coffman, D. Hundertmark, E. Stein, F. Gesztesy, F. Merle, F. Merle, G. Perelman, H. Berestycki, H. Berestycki, I. Rodnianski, I. Rodnianski, J. Krieger, J. Krieger, K. McLeod, K. Yajima, L. Demanet, M. Grillakis, M. Grillakis, M. Keel, M.I. Weinstein, M.I. Weinstein, M.K. Kwong, Marius Beceanu, P.L. Kelley, P.W. Bates, R.T. Glassey, S. Agmon, S. Cuccagna, S. Cuccagna, T. Cazenave, W. Schlag   +34 more
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Geometrical characterization of semilinear isomorphisms of vector spaces and semilinear homeomorphisms of normed spaces [PDF]

, 2013
Let $V$ and $V'$ be vector spaces over division rings (possible infinite-dimensional) and let ${\mathcal P}(V)$ and ${\mathcal P}(V')$ be the associated projective spaces.
Pankov, Mark
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