u = d + e
The symbol + is used as infix notation for the addition of Lie derivations $M\ \to\ L$ with the same defining map $f: M\ \to\ L$.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/GradedLieAlgebras/doc.m2:2482:0.