字母的连接与自由群的下中心序列
Linking of letters and the lower central series of free groups
摘要:
我们通过字母的连接发展了自由群的下中心序列的不变量,表明它们跨越了下中心序列子项的有理线性对偶。我们建立在一个方法,李余代数通过操作,设置阶段推广到任何组的下中心序列李代数。我们的方法得到了自由李代数的一个新的上基。我们比较与经典的福克斯衍生物的方法。v2:阐述的实质性改进
英文摘要:
We develop invariants of the lower central series of free groups through linking of letters, showing they span the rational linear dual of the lower central series subquotients. We build on an approach to Lie coalgebras through operads, setting the stage for generalization to the lower central series Lie algebra of any group. Our approach yields a new co-basis for free Lie algebras. We compare with the classical approach of Fox derivatives. v2: substantial refinement of exposition
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