Before revision: Prerequisite partial order The more contentful axioms associated with quasi-ordinal and well-graded knowledge spaces each imply that the knowledge space forms a well-understood (and heavily studied) mathematical structure: A quasi-ordinal knowledge space is a distributive lattice under set union and set intersection.
After revision: Prerequcan be associated withite partial order The more contentful axioms associated with quasi-ordinal and well-graded knowledge spaces each imply that the knowledge space forms a well-understood (and heavily studied) mathematical structure: A quasi-ordinal knowledge space is a distributive lattice under set union and set intersection.