オイラーの五角数定理
1. Pentagonal number theoremIn mathematics, the pentagonal number theorem, originally due to Euler, relates the product and series representations of the Euler function. It states that In other words, A striking feature of this expansion is the amount of cancellation in the product. The indices 1, 2, 5, 7, 12, ... appearing on the right hand side are called pentagonal numbers (or more accurately, generalized pentagonal numbers). If we treat this series as a power series, the radius of convergence is 1.
Read “Pentagonal number theorem” on English Wikipedia
Read “オイラーの五角数定理” on Japanese Wikipedia
Read “Pentagonal number theorem” on DBpedia
Read “Pentagonal number theorem” on English Wikipedia
Read “オイラーの五角数定理” on Japanese Wikipedia
Read “Pentagonal number theorem” on DBpedia
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