u=x + y
The symbol + is used as infix notation for the Ext-algebra addition. The elements $x$ and $y$ must have the same weight and sign.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/GradedLieAlgebras/doc.m2:2208:0.