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1.6 Exercise Prove that any two nodes x and y in a rooted tree have a unique least common ancestor 2. This simply means that
1.6 Exercise Prove that any two nodes x and y in a rooted tree have a unique least common ancestor 2. This simply means that there is a path P1 from z to 1, and a path P2 from z to y, and that the only verter those two paths have in common is z. (And further, that there is exactly one node z with this property.)
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