De arte alea is a lost work on gambling, which is thought to have been written by the Roman emperor Claudius.
Gaming historian Harold Murray has speculated that this book if found could contain evidence for the relationship between the board games XII Scripta[?] and Tabula.
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... be removed under a more careful treatment.
On the other hand, there certainly are times when the empty set is a special case and really does need to be excluded from a ...