Explore the intricacies of the stabilizer Lie algebra of the harmonic coproduct in this 12-minute conference talk by K. Yaddaden from IRMA Strasbourg. Delve into the realms of algebra, topology, and their connections to the Grothendieck-Teichmüller group. Gain insights into advanced mathematical concepts and their applications in this concise yet informative presentation organized by NCCR SwissMAP.