 Generalized Weyl algebra (source code)

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= Generalized Weyl algebra
{title2=$D(\sigma,t)$}

For a ring $D$, an automorphism $\sigma$ and central $t$, adjoin $X,Y$ with $Xd=\sigma(d)X$, $Yd=\sigma^{-1}(d)Y$, $YX=t$ and $XY=\sigma(t)$. This construction includes <Weyl algebras> and rank-one <universal enveloping algebras>.

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