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layout: stdlib-reference
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# ILogical\.not

## Description

Performs a logical NOT operation on this value, returning the logical negation.




## Signature 

<pre>
<a href="index.html" class="code_type">ILogical</a>.<span class="code_keyword">This</span> <a href="index.html" class="code_type">ILogical</a>.<a href="not.html">not</a>();

</pre>