... an upper bound (of the set) is a number which is greater than or equal to every number in the set, The upper ... limits of a set of numbers. An upper bound M of a set S of numbers is a number such that x?M for all x in S. The supremum of S is its least upper bound., tõkestatus - järjestatud hulga alamhulga omadus tervikuna järgneda (eelneda) selle hulga mingile elemendile; sel juhul öeldakse, et alamhulk on alt (ülalt) tõkestatud. Lineaarselt järjestatud hulk on