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2. Maximal and minimal elements - Wikipedia

   en.wikipedia.org/wiki/Maximal_and_minimal_elements

   The red subset = {1,2,3,4} has two maximal elements, viz. 3 and 4, and one minimal element, viz. 1, which is also its least element. In mathematics , especially in order theory , a maximal element of a subset S {\displaystyle S} of some preordered set is an element of S {\displaystyle S} that is not smaller than any other element in S ...

3. Greatest element and least element - Wikipedia

   en.wikipedia.org/wiki/Greatest_element_and_least...

   The red subset = {,,,,,} has one greatest element, viz. 30, and one least element, viz. 1. These elements are also maximal and minimal elements , respectively, of the red subset. In mathematics , especially in order theory , the greatest element of a subset S {\displaystyle S} of a partially ordered set (poset) is an element of S {\displaystyle ...

4. List of order structures in mathematics - Wikipedia

   en.wikipedia.org/wiki/List_of_order_structures...

   Lattices, partial orders in which each pair of elements has a greatest lower bound and a least upper bound. Many different types of lattice have been studied; see map of lattices for a list. Partially ordered sets (or posets ), orderings in which some pairs are comparable and others might not be

5. Order theory - Wikipedia

   en.wikipedia.org/wiki/Order_theory

   In a partially ordered set there may be some elements that play a special role. The most basic example is given by the least element of a poset. For example, 1 is the least element of the positive integers and the empty set is the least set under the subset order. Formally, an element m is a least element if: m ≤ a, for all elements a of the ...

6. Well-ordering principle - Wikipedia

   en.wikipedia.org/wiki/Well-ordering_principle

   Then, by the well-ordering principle, there is a least element ; cannot be prime since a prime number itself is considered a length-one product of primes. By the definition of non-prime numbers, n {\displaystyle n} has factors a , b {\displaystyle a,b} , where a , b {\displaystyle a,b} are integers greater than one and less than n ...

7. Completeness (order theory) - Wikipedia

   en.wikipedia.org/wiki/Completeness_(order_theory)

   Other common names for the least element are bottom and zero (0). The dual notion, the empty lower bound, is the greatest element, top, or unit (1). Posets that have a bottom are sometimes called pointed, while posets with a top are called unital or topped. An order that has both a least and a greatest element is bounded.