Unipotent character sheaves and strata of a reductive group
Unipotent character sheaves and strata of a reductive group
Let <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper H"> <mml:semantics> <mml:mi>H</mml:mi> <mml:annotation encoding="application/x-tex">H</mml:annotation> </mml:semantics> </mml:math> </inline-formula> be a connected reductive group over an algebraically closed field. We define a surjective map from the set <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper C upper S left-parenthesis upper H right-parenthesis"> <mml:semantics> <mml:mrow> <mml:mi>C</mml:mi> <mml:mi>S</mml:mi> <mml:mo stretchy="false">(</mml:mo> …