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Reference.org
Shift theorem
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the (exponential) shift theorem is a <a href="/facts/Theorem/f2Pe1FMD">theorem</a> about <a href="/facts/Polynomial/Lzak8VVx">polynomial</a> <a href="/facts/Differential_operators/Nr15J0IE">differential operators</a> (<i>D</i>-operators) and <a href="/facts/Exponential_function/ewlYxvR2">exponential functions</a>. It permits one to eliminate, in certain cases, the exponential from under the <i>D</i>-operators. </p>