Specialization of quadratic and symmetric, bilinear forms, and a norm theorem
Manfred Knebusch (1973)
Acta Arithmetica
A. Earnest, J. Hsia (1977)
Acta Arithmetica
C. Riehm, I. Hambleton (1978)
Inventiones mathematicae
Gregory C. Verchota (2014)
Journal of the European Mathematical Society
A family of linear homogeneous 4th order elliptic differential operators with real constant coefficients, and bounded nonsmooth convex domains are constructed in so that the have no constant coefficient coercive integro-differential quadratic forms over the Sobolev spaces .
Szechtman, Fernando (2005)
ELA. The Electronic Journal of Linear Algebra [electronic only]
Tisseur, Françoise, Graillat, Stef (2006)
ELA. The Electronic Journal of Linear Algebra [electronic only]
Davies, Philip I. (2004)
ELA. The Electronic Journal of Linear Algebra [electronic only]
Mehrmann, Volker, Xu, Hongguo (1999)
ELA. The Electronic Journal of Linear Algebra [electronic only]
Mackey, D.Steven, Mackey, Niloufer, Tisseur, Françoise (2003)
ELA. The Electronic Journal of Linear Algebra [electronic only]
Leonidas Konguetsof (1996)
Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
Charles R. Johnson, Robert B. Reams (2016)
Special Matrices
A copositive matrix A is said to be exceptional if it is not the sum of a positive semidefinite matrix and a nonnegative matrix. We show that with certain assumptions on A−1, especially on the diagonal entries, we can guarantee that a copositive matrix A is exceptional. We also show that the only 5-by-5 exceptional matrix with a hollow nonnegative inverse is the Horn matrix (up to positive diagonal congruence and permutation similarity).
Lando Degoli (1987)
Annales scientifiques de l'Université de Clermont. Mathématiques
Julian Ławrynowicz, Katarzyna Kędzia, Osamu Suzuki (1991)
Annales Polonici Mathematici
Hurwitz pairs and triples are discussed in connection with algebra, complex analysis, and field theory. The following results are obtained: (i) A field operator of Dirac type, which is called a Hurwitz operator, is introduced by use of a Hurwitz pair and its characterization is given (Theorem 1). (ii) A field equation of the elliptic Neveu-Schwarz model of superstring theory is obtained from the Hurwitz pair (⁴,³) (Theorem 2), and its counterpart connected with the Hurwitz triple is mentioned....
J.-D. Therond (1976)
Mémoires de la Société Mathématique de France
R. Radau (1869)
Nouvelles annales de mathématiques : journal des candidats aux écoles polytechnique et normale
H.C. Lee (1948)
Commentarii mathematici Helvetici
Ph. Revoy (1971)
Annales scientifiques de l'École Normale Supérieure
Gram (1874)
Mathematische Annalen
Marek Jukl (1996)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
Kyurshina, M.I., Yakovlev, A.V. (1999)
Zapiski Nauchnykh Seminarov POMI