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<a accesskey="3" href="page.php?w=non-classical_logic&amp;p=2">3.Next</a>
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<p><b>Non-classical logics</b> (sometimes <b>alternative logics</b>) are <a href="page.php?w=formal_system">formal system</a>s that differ in a significant way from <a href="page.php?w=Classical_logic">standard logical systems</a> such as <a href="page.php?w=Propositional_logic">propositional</a> and <a href="page.php?w=Predicate_logic">predicate</a> logic. There are several ways in which this is commonly the case, including by way of extensions, deviations, and variations. The aim of these departures is to make it possible to construct different</p><p>
<a accesskey="3" href="page.php?w=non-classical_logic&amp;p=2">3.Next</a>
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