= Victor Ufnarovski
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Victor Ufnarovski studied the <arithmetic derivative> with <Bo Åhlander>. Their definition assigns derivative one to every <prime number> and extends by the <product rule>. For $n=\prod p_i^{a_i}$, the resulting formula $n\sum_i a_i/p_i$ turns differentiation into an operation governed by <integer factorization>, rather than an ordinary derivative of a real-variable function.<How to Differentiate a Number by Victor Ufnarovski and Bo Åhlander>[Section 1, Theorem 1]{ref}
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