Riccati equations for abnormal time scale quadratic functionals

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Authors

HILSCHER Roman ZEIDAN Vera Michel

Year of publication 2008
Type Article in Periodical
Magazine / Source Journal of Differential Equations
MU Faculty or unit

Faculty of Science

Citation
Web http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WJ2-4R3BWJF-5&_user=835458&_coverDate=03%2F15%2F2008&_alid=691313609&_rdoc=1&_fmt=summary&_orig=search&_cdi=6866&_sort=d&_docanchor=&view=c&_ct=2&_acct=C000045159&_version=1&_urlVersion=0&_userid
Field General mathematics
Keywords Time scale; Riccati equation; Quadratic functional; Positivity; Nonnegativity; Normality; Controllability; Conjoined basis
Description This paper focuses on developing new Riccati-type conditions for an abnormal time scale symplectic system (S). These conditions provide characterizations of the nonnegativity (with and without a certain ``image condition'') and positivity of the quadratic functionals associated with such a system. The novelty of these conditions rely on the natural conjoined basis (Xa,Ua) of (S) in which Xa(t) is not necessarily invertible, and thus the system (S) could be abnormal. These results are new even in the special case of continuous time, as are some of them in the discrete time setting.
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