<p>L. A. Shemetkov posed a Problem 9.74 in Kourovka Notebook to find all local formations <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathfrak {F}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="fraktur">F</mi> </math></EquationSource> </InlineEquation> of finite groups such that every finite minimal non-<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathfrak {F}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="fraktur">F</mi> </math></EquationSource> </InlineEquation>-group is either a Schmidt group or a group of prime order. All known solutions to this problem are obtained under the assumption that every minimal non-<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathfrak {F}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="fraktur">F</mi> </math></EquationSource> </InlineEquation>-group is soluble or under the equivalent one. Using the above mentioned solutions we present a polynomial in <i>n</i> time check for a local formation <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathfrak {F}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="fraktur">F</mi> </math></EquationSource> </InlineEquation> with bounded <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq5.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="35" /> </InlineMediaObject> <EquationSource Format="TEX">\(\pi ({\mathfrak {F}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>π</mi> <mo stretchy="false">(</mo> <mi mathvariant="fraktur">F</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> to be a formation of soluble groups with the Shemtkov property where <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11587_2024_924_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="99" /> </InlineMediaObject> <EquationSource Format="TEX">\(n=\max \pi ({\mathfrak {F}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>=</mo> <mo movablelimits="true">max</mo> <mi>π</mi> <mo stretchy="false">(</mo> <mi mathvariant="fraktur">F</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>.</p>

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On formations of soluble finite groups with the Shemetkov property

  • Viachaslau I. Murashka

摘要

L. A. Shemetkov posed a Problem 9.74 in Kourovka Notebook to find all local formations \({\mathfrak {F}}\) F of finite groups such that every finite minimal non- \({\mathfrak {F}}\) F -group is either a Schmidt group or a group of prime order. All known solutions to this problem are obtained under the assumption that every minimal non- \({\mathfrak {F}}\) F -group is soluble or under the equivalent one. Using the above mentioned solutions we present a polynomial in n time check for a local formation \({\mathfrak {F}}\) F with bounded \(\pi ({\mathfrak {F}})\) π ( F ) to be a formation of soluble groups with the Shemtkov property where \(n=\max \pi ({\mathfrak {F}})\) n = max π ( F ) .