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<p>states, eigenstates/eigenfunctions, equilibrium points, and <a href="page.php?w=setpoint_%28control_system%29">setpoint</a>s.</p>

<p>In <a href="page.php?w=control_theory">control theory</a>, negative refers to the sign of the multiplier in mathematical models for feedback. In delta notation, -?output is added to or mixed into the input. In multivariate systems, vectors help to illustrate how several influences can both partially complement and partially oppose each other.</p>

<p>Some authors, in particular with respect to modelling <a href="page.php?w=System_dynamics">business systems</a>,</p><p>
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