There are two possible ways of implementing lift using setupLift. In the first one, we use a function:
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In the second one, we define a ring map which is a partial inverse to the promotion map:
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The object setupLift is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Macaulay2Doc/functions/setupLift-doc.m2:46:0.