<p>We introduce and study conjugate reversibility (or <i>c</i>-reversibility) in the complex special linear group <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\( \textrm{SL}(n,\mathbb {C})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>SL</mtext> <mo stretchy="false">(</mo> <mi>n</mi> <mo>,</mo> <mi mathvariant="double-struck">C</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, the property that an element is conjugate to the inverse of its complex conjugate. We prove that every <i>c</i>-reversible element of <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\( \textrm{SL}(n, \mathbb {C})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>SL</mtext> <mo stretchy="false">(</mo> <mi>n</mi> <mo>,</mo> <mi mathvariant="double-struck">C</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is strongly <i>c</i>-reversible. We provide a complete classification of <i>c</i>-reversible elements based on their conjugacy invariants. This leads to an algebraic characterization of projective transformations. As a special case, a finer classification in <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\( \textrm{SL}(4, \mathbb {C})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>SL</mtext> <mo stretchy="false">(</mo> <mn>4</mn> <mo>,</mo> <mi mathvariant="double-struck">C</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> is obtained in terms of trace conditions and resultant computations.</p>

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Conjugate reversibility in complex special linear groups

  • Krishnendu Gongopadhyay,
  • Rahul Mondal

摘要

We introduce and study conjugate reversibility (or c-reversibility) in the complex special linear group \( \textrm{SL}(n,\mathbb {C})\) SL ( n , C ) , the property that an element is conjugate to the inverse of its complex conjugate. We prove that every c-reversible element of \( \textrm{SL}(n, \mathbb {C})\) SL ( n , C ) is strongly c-reversible. We provide a complete classification of c-reversible elements based on their conjugacy invariants. This leads to an algebraic characterization of projective transformations. As a special case, a finer classification in \( \textrm{SL}(4, \mathbb {C})\) SL ( 4 , C ) is obtained in terms of trace conditions and resultant computations.