u=x - y
The symbol - is used as infix notation for the Lie subtraction. The elements $x$ and $y$ must hade the same weight and sign.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/GradedLieAlgebras/doc.m2:1953:0.