<p>Let (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C},\mathbb{E},\mathfrak{s}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> <mo mathvariant="script">,</mo> <mrow> <mi mathvariant="double-struck">E</mi> </mrow> <mo mathvariant="script">,</mo> <mrow> <mi mathvariant="fraktur">s</mi> </mrow> </math></EquationSource> </InlineEquation>) be an <i>n</i>-exangulated category with enough projectives and enough injectives, and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="27" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{X}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">X</mi> </mrow> </math></EquationSource> </InlineEquation> be a cluster-tilting subcategory of <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> </math></EquationSource> </InlineEquation>. Liu and Zhou have shown that the quotient category <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}/\mathscr{X}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> <mrow> <mo mathvariant="script">/</mo> </mrow> <mrow> <mi mathvariant="script">X</mi> </mrow> </math></EquationSource> </InlineEquation> is an <i>n</i>-abelian category. In this paper, we prove that if <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> </math></EquationSource> </InlineEquation> has Auslander–Reiten <i>n</i>-exangles, then <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="49" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}/\mathscr{X}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> <mrow> <mo mathvariant="script">/</mo> </mrow> <mrow> <mi mathvariant="script">X</mi> </mrow> </math></EquationSource> </InlineEquation> has Auslander–Reiten <i>n</i>-exact sequences. Moreover, we also show that if a Frobenius <i>n</i>-exangulated category <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> </math></EquationSource> </InlineEquation> has Auslander–Reiten <i>n</i>-exangles, then the stable category <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq8.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(\overline{\mathscr{C}}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mover> <mrow> <mi mathvariant="script">C</mi> </mrow> <mo accent="false">¯</mo> </mover> </math></EquationSource> </InlineEquation> of <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11464_2024_38_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathscr{C}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mi mathvariant="script">C</mi> </mrow> </math></EquationSource> </InlineEquation> has Auslander–Reiten (<i>n</i> + 2)-angles.</p>

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Higher Auslander-Reiten Sequences Revisited

  • Jian He,
  • Hangyu Yin,
  • Panyue Zhou

摘要

Let ( \(\mathscr{C},\mathbb{E},\mathfrak{s}\) C , E , s ) be an n-exangulated category with enough projectives and enough injectives, and \(\mathscr{X}\) X be a cluster-tilting subcategory of \(\mathscr{C}\) C . Liu and Zhou have shown that the quotient category \(\mathscr{C}/\mathscr{X}\) C / X is an n-abelian category. In this paper, we prove that if \(\mathscr{C}\) C has Auslander–Reiten n-exangles, then \(\mathscr{C}/\mathscr{X}\) C / X has Auslander–Reiten n-exact sequences. Moreover, we also show that if a Frobenius n-exangulated category \(\mathscr{C}\) C has Auslander–Reiten n-exangles, then the stable category \(\overline{\mathscr{C}}\) C ¯ of \(\mathscr{C}\) C has Auslander–Reiten (n + 2)-angles.