On minimal complements in groups

Arindam Biswas, Jyoti Prakash Saha

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Let W, W⊆ G be non-empty subsets in an arbitrary group G. The set W is said to be a complement to W if W· W= G and it is minimal if no proper subset of W is a complement to W. We show that, if W is finite then every complement of W has a minimal complement, answering a problem of Nathanson. This also shows the existence of minimal r-nets for every r⩾ 0 in finitely generated groups. Further, we give necessary and sufficient conditions for the existence of minimal complements of a certain class of infinite subsets in finitely generated abelian groups, partially answering another problem of Nathanson. Finally, we provide infinitely many examples of infinite subsets of abelian groups of arbitrary finite rank admitting minimal complements.

Original languageEnglish
Pages (from-to)823-847
Number of pages25
JournalRamanujan Journal
Issue number3
StatePublished - 1 Aug 2021
Externally publishedYes


  • Additive complements
  • Additive number theory
  • Minimal complements
  • Sumsets

ASJC Scopus subject areas

  • Algebra and Number Theory


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