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“School of Mathematics”

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Paper   IPM / M / 14997
School of Mathematics
  Title:   Zero divisors and units with small supports in group algebras of torsion-free groups
  Author(s):  Alireza Abdollahi (Joint with Z. Taheri)
  Status:   Published
  Journal: Comm. Algebra
  Year:  2017
  Pages:   DOI: 10.1080/00927872.2017.1344688
  Supported by:  IPM
  Abstract:
Kaplansky�??s zero divisor conjecture (unit conjecture, respectively) states that for a torsion-free group G and a field F, the group ring F[G] has no zero divisors (has no units with supports of size greater than 1). In this paper, we study possible zero divisors and units in F[G] whose supports have size 3. For any field F and all torsion-free groups G,we prove that if αβ = 0 for some non-zero α, β �?? F[G] such that - supp(α) - = 3, then - supp(β) - �?� 10. If F = F2 is the field with 2 elements, the latter result can be improved so that - supp(β) - �?� 20. This improves a result in Schweitzer [J. Group Theory, 16 (2013), no. 5, 667�??693]. Concerning the unit conjecture, we prove that if αβ = 1 for some α, β �?? F[G] such that - supp(α) - = 3, then - supp(β) - �?� 9. The latter improves a part of a result in Dykema et al. [Exp. Math., 24 (2015), 326�??338] to arbitrary fields.

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