A = QQ<|x,y|>
This is the type of a free algebra over a commutative ring R (i.e. a tensor algebra over R).
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The object FreeAlgebra is a type, with ancestor classes EngineRing < Ring < Type < MutableHashTable < HashTable < Thing.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/AssociativeAlgebras/doc.m2:492:0.