<p>Let <i>p</i> be an odd prime. Let <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({G = SL_2(\mathbb {F}_p)}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mo>=</mo> <mi>S</mi> <msub> <mi>L</mi> <mn>2</mn> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="double-struck">F</mi> <mi>p</mi> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and let <i>B</i> denote the subgroup of upper triangular matrices of <i>G</i>. Finally, let <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\({\mathbb {F}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="double-struck">F</mi> </math></EquationSource> </InlineEquation> be an algebraically closed field of characteristic <i>p</i>. The Green correspondence gives a bijection between the non-projective indecomposable <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\({\mathbb {F}[G]}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">F</mi> <mo stretchy="false">[</mo> <mi>G</mi> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation> modules and non-projective indecomposable <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\({\mathbb {F}[B]}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">F</mi> <mo stretchy="false">[</mo> <mi>B</mi> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation> modules, realised by restriction and induction. In this paper, after recalling a suitable description of the non-projective indecomposable modules for these group algebras, we explicitly describe the Green correspondence bijection. We do this by pinpointing the modules’ position on the Stable Auslanden-Reiten quivers. Finally, we obtain two corollaries in terms of this description: formula for lifting the <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\({\mathbb {F}[B]}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">F</mi> <mo stretchy="false">[</mo> <mi>B</mi> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation> module decomposition of an <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\({\mathbb {F}[G]}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="double-struck">F</mi> <mo stretchy="false">[</mo> <mi>G</mi> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation> module, and a complete description of <InlineEquation ID="IEq10"> <EquationSource Format="TEX">\({\text { Ind}_B^G}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mspace width="0.333333em" /> <msubsup> <mtext>Ind</mtext> <mi>B</mi> <mi>G</mi> </msubsup> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq11"> <EquationSource Format="TEX">\({\text { Res}^G_B}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mspace width="0.333333em" /> <msubsup> <mtext>Res</mtext> <mi>B</mi> <mi>G</mi> </msubsup> </mrow> </math></EquationSource> </InlineEquation>.</p>

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The p-Modular Green Correspondence for \({\text {SL}_2(\mathbb {F}_p)}\)

  • Denver-James Logan Marchment

摘要

Let p be an odd prime. Let \({G = SL_2(\mathbb {F}_p)}\) G = S L 2 ( F p ) and let B denote the subgroup of upper triangular matrices of G. Finally, let \({\mathbb {F}}\) F be an algebraically closed field of characteristic p. The Green correspondence gives a bijection between the non-projective indecomposable \({\mathbb {F}[G]}\) F [ G ] modules and non-projective indecomposable \({\mathbb {F}[B]}\) F [ B ] modules, realised by restriction and induction. In this paper, after recalling a suitable description of the non-projective indecomposable modules for these group algebras, we explicitly describe the Green correspondence bijection. We do this by pinpointing the modules’ position on the Stable Auslanden-Reiten quivers. Finally, we obtain two corollaries in terms of this description: formula for lifting the \({\mathbb {F}[B]}\) F [ B ] module decomposition of an \({\mathbb {F}[G]}\) F [ G ] module, and a complete description of \({\text { Ind}_B^G}\) Ind B G and \({\text { Res}^G_B}\) Res B G .