Comments on `A discrete optimal control problem for descriptor systems'

Hans Ravn

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    In the above-mentioned work (see ibid., vol.34, p.177-81 (1989)), necessary and sufficient optimality conditions are derived for a discrete-time optimal problem, as well as other specific cases of implicit and explicit dynamic systems. The commenter corrects a mistake and demonstrates that there is not an `if and only if' correspondence between stationarity conditions and minimization of the Hamiltonian. In replying, Lin and Yang acknowledge this and also give a version of theorem two in the context of their response to achieve a balance
    Original languageEnglish
    JournalI E E E Transactions on Automatic Control
    Issue number8
    Pages (from-to)985-987
    Publication statusPublished - 1990

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