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  2. Empty set - Wikipedia

    en.wikipedia.org/wiki/Empty_set

    The Cartesian product of A and the empty set is the empty set; For any property P: For every element of , the property P holds (vacuous truth). There is no element of for which the property P holds. Conversely, if for some property P and some set V, the following two statements hold:

  3. Almost everywhere - Wikipedia

    en.wikipedia.org/wiki/Almost_everywhere

    The empty set is not in F; A property P of points in X holds almost everywhere, relative to an ultrafilter F, if the set of points for which P holds is in F. For example, one construction of the hyperreal number system defines a hyperreal number as an equivalence class of sequences that are equal almost everywhere as defined by an ultrafilter.

  4. Property (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Property_(mathematics)

    In mathematics, a property is any characteristic that applies to a given set. [1] Rigorously, a property p defined for all elements of a set X is usually defined as a function p: X → {true, false}, that is true whenever the property holds; or, equivalently, as the subset of X for which p holds; i.e. the set {x | p(x) = true}; p is its indicator function.

  5. Well-ordering principle - Wikipedia

    en.wikipedia.org/wiki/Well-ordering_principle

    Well-ordering principle. In mathematics, the well-ordering principle states that every non-empty subset of nonnegative integers contains a least element. [1] In other words, the set of nonnegative integers is well-ordered by its "natural" or "magnitude" order in which precedes if and only if is either or the sum of and some nonnegative integer ...

  6. Axiom of choice - Wikipedia

    en.wikipedia.org/wiki/Axiom_of_choice

    Statement. A choice function (also called selector or selection) is a function f, defined on a collection X of nonempty sets, such that for every set A in X, f (A) is an element of A. With this concept, the axiom can be stated: Axiom — For any set X of nonempty sets, there exists a choice function f that is defined on X and maps each set of X ...

  7. Heap (data structure) - Wikipedia

    en.wikipedia.org/wiki/Heap_(data_structure)

    In computer science, a heap is a tree -based data structure that satisfies the heap property: In a max heap, for any given node C, if P is a parent node of C, then the key (the value) of P is greater than or equal to the key of C. In a min heap, the key of P is less than or equal to the key of C. [1] The node at the "top" of the heap (with no ...

  8. Mar-a-Lago inventory shows top secret docs, news clippings ...

    www.aol.com/mar-lago-inventory-shows-top...

    An inventory from last month’s FBI search of former President Donald Trump’s Mar-a-Lago home indicates that agents unearthed 18 top secrets documents, 31 documents carrying confidential ...

  9. Naive set theory - Wikipedia

    en.wikipedia.org/wiki/Naive_set_theory

    The empty set is a subset of every set (the statement that all elements of the empty set are also members of any set A is vacuously true). The set of all subsets of a given set A is called the power set of A and is denoted by or (); the "P" is sometimes in a script font: ⁠ ℘ ⁠.