<p>Let <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\mathfrak {o}_l\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="fraktur">o</mi> <mi>l</mi> </msub> </math></EquationSource> </InlineEquation> be a finite principal ideal local ring of length <i>l</i>. The degenerate Whittaker space associated with a representation of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\textrm{GL}_{2n}(\mathfrak {o}_l)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mrow> <mn>2</mn> <mi>n</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">o</mi> <mi>l</mi> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> is a representation of <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\textrm{GL}_n(\mathfrak {o}_l)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mi>n</mi> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">o</mi> <mi>l</mi> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>. For strongly cuspidal representations of <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\textrm{GL}_{2n}(\mathfrak {o}_l)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mrow> <mn>2</mn> <mi>n</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">o</mi> <mi>l</mi> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> the structure of degenerate Whittaker space is described by Prasad’s conjecture, which has been proven for <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\textrm{GL}_4(\mathfrak {o}_2)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mn>4</mn> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">o</mi> <mn>2</mn> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>. In this paper, we describe the degenerate Whittaker space for certain induced representations of <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(\textrm{GL}_4(\mathfrak {o}_2)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mn>4</mn> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="fraktur">o</mi> <mn>2</mn> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>, specifically those induced from subgroups analogous to the maximal parabolic subgroups of <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\textrm{GL}_4(\mathbb {F}_q)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>GL</mtext> <mn>4</mn> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi mathvariant="double-struck">F</mi> <mi>q</mi> </msub> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>.</p>

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On the Degenerate Whittaker space for some induced representations of \(\textrm{GL}_4(\mathfrak {o}_2)\)

  • Ankita Parashar,
  • Shiv Prakash Patel

摘要

Let \(\mathfrak {o}_l\) o l be a finite principal ideal local ring of length l. The degenerate Whittaker space associated with a representation of \(\textrm{GL}_{2n}(\mathfrak {o}_l)\) GL 2 n ( o l ) is a representation of \(\textrm{GL}_n(\mathfrak {o}_l)\) GL n ( o l ) . For strongly cuspidal representations of \(\textrm{GL}_{2n}(\mathfrak {o}_l)\) GL 2 n ( o l ) the structure of degenerate Whittaker space is described by Prasad’s conjecture, which has been proven for \(\textrm{GL}_4(\mathfrak {o}_2)\) GL 4 ( o 2 ) . In this paper, we describe the degenerate Whittaker space for certain induced representations of \(\textrm{GL}_4(\mathfrak {o}_2)\) GL 4 ( o 2 ) , specifically those induced from subgroups analogous to the maximal parabolic subgroups of \(\textrm{GL}_4(\mathbb {F}_q)\) GL 4 ( F q ) .