Specialization of quadratic and symmetric, bilinear forms, and a norm theorem
Spinor genera under field extensions, I
Splitting of Hermitian Forms over Group Rings.
Strongly elliptic linear operators without coercive quadratic forms I. Constant coefficient operators and forms
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 .
Structure of the group preserving a bilinear form.
Structured condition numbers and backward errors in scalar product spaces.
Structured conditioning of matrix functions.
Structured Jordan canonical forms for structured matrices that are Hermitian, skew Hermitian or unitary with respect to indefinite inner products.
Structured tools for structured matrices.
Structures Algebraiques munis, avec des lois de composition generalisees - Generalisations du produit scalaire
Sufficient conditions to be exceptional
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).
Sulla caratteristica della jacobiana dei sistemi lineari irriducibili di quadriche
Supercomplex structures, surface soliton equations, and quasiconformal mappings
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....
Sur deux conjectures de Small
Sur la résultante de trois formes quadratiques ternaires
Sur le théorème der Hurwitz-Radon pour la composition des formes quadratiques.
Sur les deux premiers invariants d'une forme quadratique
Sur quelques théorèmes fondamentaux de l'algèbre moderne
Sylvester theorem for certain free modules
-forms and their properties.