A set is a Many that allows itself to be thought of as a One.

— Georg Cantor

How to solve the ancient problem of the one and the many?

Is the one just one, and the many merely many? Or can the one contain the many, and the many reveal the one?

Many fourfolds have been shown here. Are they different aspects of  one, greater fourfold?

Or are they completely separate, incomparable and  incommensurate, except for their common cardinality?

http://plato.stanford.edu/entries/problem-of-many/

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