Infinite crossed products and group-graded rings
Infinite crossed products and group-graded rings
In this paper, we precisely determine when a crossed product <inline-formula content-type="math/mathml"> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="upper R asterisk upper G"> <mml:semantics> <mml:mrow> <mml:mi>R</mml:mi> <mml:mspace width="thickmathspace" /> <mml:mo>∗<!-- ∗ --></mml:mo> <mml:mspace width="thickmathspace" /> <mml:mi>G</mml:mi> </mml:mrow> <mml:annotation encoding="application/x-tex">R\;\ast \;G</mml:annotation> </mml:semantics> </mml:math> </inline-formula> is semiprime or prime. Indeed we show that these conditions ultimately …