ancestor(x,y)
The ancestors of y are y, parent y, parent parent y, and so on.
If x is an ancestor of y, then we also say that y is a specialization of x.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.05+ds/M2/Macaulay2/packages/Macaulay2Doc/ov_types.m2:478:0.