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<p>is good at describing many important systems.  Most LTI systems are considered "easy" to analyze, at least compared to the time-varying and/or <a href="page.php?w=nonlinear">nonlinear</a> case.  Any system that can be modeled as a linear <a href="page.php?w=differential_equation">differential equation</a> with constant coefficients is an LTI system.  Examples of such systems are <a href="page.php?w=electrical_network">electrical circuits</a> made up of <a href="page.php?w=resistor">resistor</a>s, <a href="page.php?w=inductor">inductor</a>s, and</p><p>
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