<p>A group <i>G</i> is said to have restricted centralizers if for every <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(x\in G\)</EquationSource> </InlineEquation> the centralizer <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(C_G(x)\)</EquationSource> </InlineEquation> either is finite or has finite index in <i>G</i>. Shalev showed that a profinite group with restricted centralizers is virtually abelian. Here we take interest in profinite groups <i>G</i> for which there is an integer <i>n</i> such that <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(C_G(x^n)\)</EquationSource> </InlineEquation> is either finite or open whenever <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(x\in G\)</EquationSource> </InlineEquation>. It is shown that such a group <i>G</i> has an open normal subgroup <i>T</i> with the property that <i>G</i>/<i>Z</i>(<i>T</i>) has finite exponent.</p>

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Profinite groups with restricted centralizers of powers

  • Cristina Acciarri,
  • Pavel Shumyatsky

摘要

A group G is said to have restricted centralizers if for every \(x\in G\) the centralizer \(C_G(x)\) either is finite or has finite index in G. Shalev showed that a profinite group with restricted centralizers is virtually abelian. Here we take interest in profinite groups G for which there is an integer n such that \(C_G(x^n)\) is either finite or open whenever \(x\in G\) . It is shown that such a group G has an open normal subgroup T with the property that G/Z(T) has finite exponent.