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<p><a href="page.php?w=operational_semantics">operational semantics</a> and <a href="page.php?w=axiomatic_semantics">axiomatic semantics</a>.</p>

<p><big> Type theory </big></p>
<p>Type theory is the study of <a href="page.php?w=type_system">type system</a>s; which are "a tractable syntactic method for proving the absence of certain program behaviors by classifying phrases according to the kinds of values they compute". Many programming languages are distinguished by the characteristics of their type systems.</p>

<p><big> Program analysis and transformation </big></p><p>
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