https://github.com/fricas/fricas/blob/master/src/algebra//tree.spad#L329
BinaryTreeCategory(S : SetCategory) : Category ==_
Join(BinaryRecursiveAggregate(S), shallowlyMutable,
finiteAggregate) with
Is there any reason to keep
if % has finiteAggregate then
inside the add body. Obviously the exports already include
finiteAggregate, so the condition is true.
Ralf
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