I=image(d)
If $d$ is a differential on a Lie algebra $L$, then image(d) (which is the same as the boundaries of $L$) is of type LieSubAlgebra. Otherwise, image(d) is of type LieSubSpace.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/GradedLieAlgebras/doc.m2:1318:0.