| 11. | Its universe and least element are symbolized by " U " and \ emptyset, respectively.
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| 12. | A linear order where every nonempty subset has a least element is called a well-order.
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| 13. | Its universe and least element are symbolized by " U " and \ varnothing, respectively.
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| 14. | More generally, Chomp can be played on any partially ordered set with a least element.
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| 15. | A player loses by taking the least element.
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| 16. | A join-semilattice is "'bounded "'if it has a least element, the join of the empty set.
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| 17. | Every non-empty well-ordered set has a least element.
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| 18. | The notation 0 is frequently found for the least element, even when no numbers are concerned.
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| 19. | However, if there is a least element, then it is the only minimal element of the order.
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| 20. | In particular, it contains a least element and a greatest element ( also denoted " universe " ).
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