| http://www.w3.org/ns/prov#value | - month???s column not only the Recursion Principle again, but a principle far better known to non-professional mathematics aficionados called the Axiom of Choice.So fasten your seat belt and prepare for a wild ride into the world of infinite trees.To the mathematician, a tree is a well-founded, partially ordered set such that the set of all predecessors of any element is totally ordered, having a u
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