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<p>and constraints<br/>
## <a href="page.php?w=Initial_condition">Initial</a> and <a href="page.php?w=boundary_condition">boundary condition</a>s<br/>
## <a href="page.php?w=Constraint_%28classical_mechanics%29">Classical constraints</a> and <a href="page.php?w=Kinematics">kinematic equations</a></p>

<p><big>Classifications</big></p>
<p>Mathematical models are of different types:</p>

<p><big> Linear vs. nonlinear </big></p>
<p>If all the operators in a mathematical model exhibit <a href="page.php?w=linear">linear</a>ity, the resulting mathematical model is defined</p><p>
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