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Exponential formula
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In [[combinatorics|combinatorial]] [[mathematics]], the '''exponential formula''' (called the '''polymer expansion''' in [[physics]]) states that the [[exponential generating function]] for structures on [[finite set]]s is the [[exponential function|exponential]] of the exponential generating function for connected structures. The exponential formula is a [[power series]] version of a special case of [[FaΓ di Bruno's formula]].
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