We study the natural map η between a group of binary planar trees whose leaves are labeled by elements of a free abelian group H and a certain group D(H) derived from the free Lie algebra over H. Both of these groups arise in several different topological contexts. η is known to be an isomorphism over ℚ, but not over ℤ. We determine its cokernel and attack the conjecture that it is injective.
@article{10_2140_agt_2006_6_935,
author = {Levine, Jerome},
title = {Labeled binary planar trees and {quasi-Lie} algebras},
journal = {Algebraic and Geometric Topology},
pages = {935--948},
year = {2006},
volume = {6},
number = {2},
doi = {10.2140/agt.2006.6.935},
url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2006.6.935/}
}
Levine, Jerome. Labeled binary planar trees and quasi-Lie algebras. Algebraic and Geometric Topology, Tome 6 (2006) no. 2, pp. 935-948. doi: 10.2140/agt.2006.6.935
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