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<p>moving from the case of constant coefficients on which he had already published, to variable coefficients. The innovation in operational methods is to admit that operations may not <a href="page.php?w=commutative_law">commute</a>. In 1847, Boole published The Mathematical Analysis of Logic, the first of his works on symbolic logic.</p>

<p><big> Differential equations </big></p>
<p>Boole completed two systematic treatises on mathematical subjects during his lifetime. The Treatise on <a href="page.php?w=Differential_Equations">Differential Equations</a> appeared</p><p>
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