The Rothe–Hagen identity is a mathematical identity related to the theory of partitions, specifically concerning the representations of integers as sums of parts. While detailed references specific to the identity might be scarce, it is often discussed in the context of combinatorial mathematics or number theory. The identity is named after mathematicians who have contributed to partition theory and can be expressed in various forms. Generally, it can relate different ways of summing integers or the coefficients of generating functions.
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