Abstract
Given a plant MA and a specification M/sub C/, the largest solution of the FSM equation M/sub X/ /spl middot/ M/sub A/ /spl les/ M/sub C/ contains all possible discrete controllers M/sub X/. Often we are interested in computing the complete solutions whose composition with the plant is exactly equivalent to the specification. Not every solution contained in the largest one satisfies such property, that holds instead for the complete solutions of the series topology. We study the relation between the solvability of an equation for the series topology and of the corresponding equation for the controller's topology. We establish that, if M/sub A/ is a deterministic FSM, then the FSM equation M/sub X/ /spl middot/ M/sub A/ /spl les/ M/sub C/ is solvable for the series topology with an unknown head component iff it is solvable for the controller's topology. Our proof is constructive, i.e., for a given solution M/sub B/ of the series topology it shows how to build a solution M/sub D/ of the controller's topology and vice versa.
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