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Dirichlet convolution
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<p>In <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, the Dirichlet convolution (or divisor convolution) is a <a href="/facts/Binary_operation/CYtow0bz">binary operation</a> defined for <a href="/facts/Arithmetic_function/hULxwsgm">arithmetic functions</a>; it is important in <a href="/facts/Number_theory/zhoa7zrc">number theory</a>. It was developed by <a href="/facts/Peter_Gustav_Lejeune_Dirichlet/b5UIU7Uy">Peter Gustav Lejeune Dirichlet</a>. </p>