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In the paper by Moshe Yarom:the lexicographic kernel of a cooperative game in the abstract it is stated on the last line: kernel is a geometrical locus in the non-empty -core, whereas nucleolus is not.
I do not follow this statement along with the notion a "geometrical locus".
I.e. I'm looking for an explanation of the statement together with the definition a geometrical locus of the non-empty -core.