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Pentagonal number theorem information


In mathematics, Euler's pentagonal number theorem relates the product and series representations of the Euler function. It states that

In other words,

The exponents 1, 2, 5, 7, 12, ... on the right hand side are given by the formula gk = k(3k − 1)/2 for k = 1, −1, 2, −2, 3, ... and are called (generalized) pentagonal numbers (sequence A001318 in the OEIS). (The constant term 1 corresponds to .) This holds as an identity of convergent power series for , and also as an identity of formal power series.

A striking feature of this formula is the amount of cancellation in the expansion of the product.

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Pentagonal number theorem

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involved in the construction of pentagonal numbers are not rotationally symmetrical. The nth pentagonal number pn is the number of distinct dots in a pattern...

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is the Euler function; by Euler's pentagonal number theorem this function is an alternating sum of pentagonal number powers of its argument. p ( n ) =...

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proof of a classical result on the number of certain integer partitions. Bijective proofs of the pentagonal number theorem. Bijective proofs of the formula...

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corresponding affine Kac–Moody algebra. Jacobi's proof relies on Euler's pentagonal number theorem, which is itself a specific case of the Jacobi Triple Product...

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on 2013-05-29. Retrieved 2010-05-13. Weisstein, Eric W. "Pentagonal Square Triangular Number". MathWorld. The Penguin Dictionary of Curious and Interesting...

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summandization of the now mentioned Pochhammer product is described by the Pentagonal number theorem in this way: ( x ; x ) ∞ = 1 + ∑ n = 1 ∞ [ − x Fn ( 2 n − 1 )...

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contains a statement of Euler's formula and a statement of the pentagonal number theorem, which he had discovered earlier and would publish a proof for...

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numbers, integer partitions, and the generating functions and pentagonal number theorem that connect these two concepts. In chapter 6, Reid brings in...

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certain non-reduced affine root system. It is related to Euler's pentagonal number theorem. ∏ n ≥ 1 ( 1 − s n ) ( 1 − s n t ) ( 1 − s n − 1 t − 1 ) ( 1 −...

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first equality. The second equality can be proved by using the pentagonal number theorem. Berndt, Bruce C. (1998). Ramanujan's Notebooks Part V. Springer...

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{1}{2}}k(3k-1))+P(n-{\frac {1}{2}}k(3k+1))]} derived from Euler's pentagonal number theorem. Written as a dfn:: §16  pn ← {1≥⍵:0≤⍵ ⋄ -⌿+⌿∇¨rec ⍵} rec ← {⍵...

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