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<p>and gives the symbols their usual meaning. There are also <a href="page.php?w=non-standard_model_of_arithmetic">non-standard models of arithmetic</a>.</p>

<p><big>History</big></p>
<p>Early logic systems includes Indian logic of <a href="page.php?w=Panini">Panini</a>, syllogistic logic of Aristotle, propositional logic of Stoicism, and Chinese logic of <a href="page.php?w=Gongsun_Long">Gongsun Long</a> (c. 325-250 BCE). In more recent times, contributors include <a href="page.php?w=George_Boole">George Boole</a>, <a href="page.php?w=Augustus_De_Morgan">Augustus De Morgan</a>,</p><p>
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