Homology, Homotopy and Applications

Volume 20 (2018)

Number 2

Racks as multiplicative graphs

Pages: 239 – 257

DOI: https://dx.doi.org/10.4310/HHA.2018.v20.n2.a12


Jacob Mostovoy (Departamento de Matemáticas, CINVESTAV, Ciudad de México, Mexico)


We interpret augmented racks as a certain kind of multiplicative graphs and show that this point of view is natural for defining rack homology. We also define the analogue of the group algebra for these objects; in particular, we see how discrete racks give rise to Hopf algebras and Lie algebras in the Loday–Pirashvili category $\mathcal{LM}$. Finally, we discuss the integration of Lie algebras in $\mathcal{LM}$ in the context of multiplicative graphs and augmented racks.


rack, multiplicative graph, Loday–Pirashvili category, Leibniz algebra

2010 Mathematics Subject Classification

05C99, 16T05, 20N99

Received 7 October 2017

Received revised 14 February 2018

Published 13 June 2018