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<td><a href="../../Contents/1/218.html">Doubles</a></td>
<td>Extension methods on System.Double.</td>
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<img src="../../GFX/PublicClass.gif" alt="Public Class" />&nbsp;<img src="../../GFX/Abstract.gif" alt="Abstract" /></td>
<td><a href="../../Contents/1/219.html">Either&lt;TFirst, TSecond, TThird, TFourth&gt;</a></td>
<td>This type encapsulates either a value of type <span class="Code">TFirst</span>,
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