Khalef Yaddaden

Khalef Yaddaden is a JSPS Postdoctoral Research Fellow at the Graduate School of Mathematics, Nagoya University (Japan). He holds a PhD in mathematics from the University of Strasbourg (France) under Benjamin Enriquez and Hidekazu Furusho. His research focuses on multiple zeta values, their cyclotomic analogues (multiple polylogarithm values at roots of unity), and connections to associators, Grothendieck-Teichmüller theory, and algebraic structures like double shuffle Lie algebras and torsors.

• University: Nagoya University
• School: Graduate School of Mathematics
• Academic Rank: Researcher

His work includes proving cyclotomic generalizations of Enriquez-Furusho's torsor results, reformulating Racinet's double shuffle constructions via crossed products, and validating Zhao's conjectures on cyclotomic multiple zeta value relations. Recent publications analyze Q-forms of Lie algebras under Galois actions and stabilization of coproducts in algebraic frameworks.

• Scientific Awards:
  • JSPS Postdoctoral Research Fellowship
• Upcoming Events:
  • August 22, 2025: Invited speaker, Kagoshima Mould Seminar, Kagoshima University
  • September 14, 2025: Invited speaker, Around associators: from integrable systems to number theory, Les Diablerets, Switzerland
  • September 29, 2025: Invited speaker, Various Aspects of Multiple Zeta Values, RIMS, Kyoto, Japan

His publications address abstract algebra, number theory, and algebraic geometry, with keywords spanning Lie algebras, cyclotomic fields, and coproducts.