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layout: stdlib-reference
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# typealias DifferentialPair\<T\>\.Differential

## Signature

<pre>
<span class='code_keyword'>typealias</span> <a href="index.html" class="code_type">DifferentialPair</a>&lt;<a href="index.html#typeparam-T" class="code_type">T</a>&gt;.<a href="differential-0.html" class="code_type">Differential</a> = 
    <a href="index.html" class="code_type">DifferentialPair</a>&lt;<a href="index.html#typeparam-T" class="code_type">T</a>.<a href="differential-0.html" class="code_type">Differential</a>&gt;;
</pre>