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<p>1890. A proof was presented by <a href="page.php?w=Constantin_Carath%C3%A9odory">Constantin Carathéodory</a> using <a href="page.php?w=measure_%28mathematics%29">measure theory</a> in 1919.</p>

<p><big> Definitions and Poincaré's formulation </big></p>
<p>Any <a href="page.php?w=dynamical_system">dynamical system</a> defined by an <a href="page.php?w=ordinary_differential_equation">ordinary differential equation</a> determines a <a href="page.php?w=flow_%28mathematics%29">flow map</a> f<sup>&nbsp;t</sup> mapping <a href="page.php?w=phase_space">phase space</a></p><p>
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