This function expresses the generators of the quadratic ideal I as a product of a row or column vector of the variables times a matrix with linear entries.
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We can perform these products over the quotient to verify that the composite is zero there.
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The object leftQuadraticMatrix is a method function.
The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/AssociativeAlgebras/doc.m2:1235:0.