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Cyclotomic identity : ウィキペディア英語版
Cyclotomic identity
In mathematics, the cyclotomic identity states that
:=\prod_^\infty\left(\right)^
where ''M'' is Moreau's necklace-counting function,
:M(\alpha,n)=\sum_\mu\left(\right)\alpha^d,
and ''μ'' is the classic Möbius function of number theory.
The name comes from the denominator, 1 − ''z'' ''j'', which is the product of cyclotomic polynomials.
The left hand side of the cyclotomic identity is the generating function for the free associative algebra on α generators, and the right hand side is the generating function for the universal enveloping algebra of the free Lie algebra on α generators. The cyclotomic identity witnesses the fact that these two algebras are isomorphic.
There is also a symmetric generalization of the cyclotomic identity found by Strehl:
:\prod_^\infty\left(\right)^=\prod_^\infty\left(\right)^
==References==

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抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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