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<a accesskey="3" href="page.php?w=Rice%27s_theorem&amp;p=2">3.Next</a>
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<p>In <a href="page.php?w=computability_theory">computability theory</a>, <b>Rice's theorem</b> states that all non-trivial semantic properties of programs are <a href="page.php?w=undecidable_problem">undecidable</a>. A semantic property is one about the program's behavior (for instance, "does the program <a href="page.php?w=halting_problem">terminate</a> for all inputs?"), unlike a syntactic property (for instance, "does the program contain an <a href="page.php?w=if-then-else">if-then-else</a> statement?"). A non-trivial property is one that is</p><p>
<a accesskey="3" href="page.php?w=Rice%27s_theorem&amp;p=2">3.Next</a>
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