ary-table-tab1 method-summary-table-tab4"><code>protected static void</code></div>
<div class="col-second odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4"><code><a href="#requireValidAlpha(double)" class="member-name-link">requireValidAlpha</a><wbr>(double&nbsp;alpha)</code></div>
<div class="col-last odd-row-color method-summary-table method-summary-table-tab1 method-summary-table-tab4">&nbsp;</div>
<div class="col-first even-row-color method-summary-table method-summ