Nonnegativity of discrete quadratic functionals corresponding to symplectic difference systems

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Authors

DOŠLÝ Ondřej HILSCHER Roman ZEIDAN Vera

Year of publication 2003
Type Article in Periodical
Magazine / Source Linear Algebra and its Applications
MU Faculty or unit

Faculty of Science

Citation
Field General mathematics
Keywords Symplectic difference system; Discrete quadratic functional; Nonnegativity; Positivity; Focal point; Conjoined basis; Riccati difference equation; Linear Hamiltonian difference system
Description We study the nonnegativity of quadratic functionals with separable endpoints which are related to the discrete symplectic system (S). In particular, we characterize the nonnegativity of these functionals in terms of (i) the focal points of the natural conjoined basis of (S) and (ii) the solvability of an implicit Riccati equation associated with (S). This result is closely related to the kernel condition for the natural conjoined basis of (S). We treat the situation when this kernel condition is possibly violated at a certain index. To accomplish this goal, we derive a new characterization of the set of admissible pairs (sequences) that does not require the validity of the above mentioned kernel condition. Finally, we generalize our results to the variable stepsize case.
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