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Quotunbounded control12/5/2023 Schumacher, “A discrete approach to compensator design for distributed parameter systems,” SIAM J. Pazy, Semigroups of operators and applications to partial differential equations, Springer-Verlag, 1983. Nitsche, “Uber ein variational zur losung von Dirichlet problemen bei verwendung von Teilraumen, die keinen randbedingungen unterworfen sind,” Abh. Triggiani, “Numerical approximations of algebraic Riccati equations for abstract systems modeled by analytic semigroups, and applications,” Math. Triggiani, Algebraic Riccati equations with applications to boundary/point control problems: Continuous theory and approximation theory, Lecture Notes in Control and Inform. Lasiecka, “Finite element approximations of compensator design for analytic generators with fully unbounded control/observations,” SIAM J. Lasiecka, “Galerkin approximations of infinite dimensional compensators for flexible structures with unbounded control action,” Acta Appl. Lasiecka, “Convergence estimates for semidiscrete approximations of nonselfadjoint parabolic equations,” SIAM J. Krejin, Linear Differential Equations in Banach Space, American Mathematical Society: Providence, RI, 1971. Kato, Perturbations Theory for Linear Operators, Springer-Verlag: New York, Berlin, 1996. Grisvard, “Characterization de quelques espaces d'interplation,” Arch. Gibson, “Approximation theory for linear quadratic Gaussian control of flexible structure,” SIAM J. Gibson, “An analysis of optimal model regulation: convergence and stability,” SIAM J. Fujiwara, “Concrete characterizations of the domains of fractional powers of same elliptic differential operators of the second order,” in Proc. Flandoli, “Algebraic Riccati equations arising in a boundary control problems,” SIAM J. Flandoli, “Riccati equations arising in a boundary control problem with distributed parameters,” SIAM J. Ichikawa, “Riccati equations with unbounded coefficients,” Ann. Curtain, “Finite dimensional compensators for parabolic distributed systems with unbounded control and observation,” SIAM J. Triggiani, “Characterization of domains of fractional powers of certain operators arising in elastic systems, and applications,” J. Triggiani, “Proof of extensions of two conjectures on structural damping for elastic systems,” Pacific J. Wahlbin, “Some convergence estimates for semidiscrete Galerkin-type approximations for parabolic equations,” SIAM J. Mitter, Representation and control of infinite dimensional systems, Birkhauser: Basel, 1993. The correct approach would be to calculate (and cache) the enableWathever values in getter functions, then let the form call the getters and enable or disable its own buttons.A. Ironically the SalesTableForm.enableUpdateJournalButtons method violates this rule, as it accepts button controls as parameters. The controls belongs to the form where they were born and should not be passed around. However this will usually make the form and the class tightly coupled, which is not what we want. The other route (you indicated in the question) would be to inform the class about the existence of the control and let the class call control.value() directly. In this case the SalesTableForm is informed of the change of the checkbox by calling a method parmSpecialAction (name arbitrarily chosen). SalesTableForm.parmSpecialAction(this.value()) You do that in the modified method of the checkbox control: boolean modified() Rather inform the other class when the unbound control is changed. You don't refer to the unbound control from another class, it is not the right approach.
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