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“While working together on the McKay conjecture, Britta Späth and Marc Cabanes fell in love and started a family.”

They found their succession

Intersection set with genes from set A and B.

Wouldn't it be more like a subset of the union of A and B? Intersection set sounds like the child only has the genes that both parents share.

True; that would be dangerously close to incest. Subset of a union, then.

FFS you nerds, get a room

(and then form a working group to devise an algebraically provable disincentive to incestuous calculation)

Way ahead of you, pal. I am my own grandpa.

With the kids being homeomorphic to the parents.