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1. A set of second category is a set that is not of first category: in other words a set that is not the union of a countable number of nowhere-dense sets. 2. An ordinal of the second class is a countable infinite ordinal 3. An ordinal of the second kind is a limit ordinal or 0 4.
When said of a set or a mathematical object whose main component is a set, it means that the cardinality of the set is less than . frequently In the context of limits, this is shorthand for arbitrarily large arguments and its relatives; as with eventually , the intended variant is implicit.
In mathematics, the limit of a sequence of sets,, … (subsets of a common set ) is a set whose elements are determined by the sequence in either of two equivalent ways: (1) by upper and lower bounds on the sequence that converge monotonically to the same set (analogous to convergence of real-valued sequences) and (2) by convergence of a sequence of indicator functions which are themselves ...
The infimum/inferior/inner limit is a set where all of these accumulation sets meet. That is, it is the intersection of all of the accumulation sets. When ordering by set inclusion, the infimum limit is the greatest lower bound on the set of accumulation points because it is contained in each of them. Hence, it is the infimum of the limit points.
In mathematics, a limit is the value that a function (or sequence) approaches as the argument (or index) approaches some value. [1] Limits of functions are essential to calculus and mathematical analysis, and are used to define continuity, derivatives, and integrals.
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Maxima and minima can also be defined for sets. In general, if an ordered set S has a greatest element m, then m is a maximal element of the set, also denoted as (). Furthermore, if S is a subset of an ordered set T and m is the greatest element of S with (respect to order induced by T), then m is a least upper bound of S in T.
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