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arXiv 2006.15869math-phmath.MP
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关于右套算子表示的Baker-Campbell-Hausdorff级数的一个注记

A note on the Baker--Campbell--Hausdorff series in terms of right-nested commutators

Ana Arnal, Fernando Casas, Cristina Chiralt

摘要:

我们得到了Baker-Campbell-Hausdorff级数$Z = \log(\e^X \, \e^Y)$在右嵌套算子下的紧表达式。减少的条款的数量源于两个事实:(i)我们使用作为一个出发点的明确表达直接涉及独立的recruitors和(ii)我们得到一个完整的一套身份之间产生的右嵌套recruitors。该程序使我们能够获得一系列更少的条款比在经典的霍尔基础上表示时,至少高达10级的条款。

英文摘要:

We get compact expressions for the Baker--Campbell--Hausdorff series $Z = \log(\e^X \, \e^Y)$ in terms of right-nested commutators. The reduction in the number of terms originates from two facts: (i) we use as a starting point an explicit expression directly involving independent commutators and (ii) we derive a complete set of identities arising among right-nested commutators. The procedure allows us to obtain the series with fewer terms than when expressed in the classical Hall basis at least up to terms of grade 10.

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