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2. Element (mathematics) - Wikipedia

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

   In mathematics, an element (or member) of a set is any one of the distinct objects that belong to that set. For example, ...

3. Set (mathematics) - Wikipedia

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

   A set of polygons in an Euler diagram This set equals the one depicted above since both have the very same elements.. In mathematics, a set is a collection of different [1] things; [2] [3] [4] these things are called elements or members of the set and are typically mathematical objects of any kind: numbers, symbols, points in space, lines, other geometrical shapes, variables, or even other ...

4. Euclid's Elements - Wikipedia

   en.wikipedia.org/wiki/Euclid's_Elements

   Elements is the oldest extant large-scale deductive treatment of mathematics. It has proven instrumental in the development of logic and modern science, and its logical rigor was not surpassed until the 19th century. Euclid's Elements has been referred to as the most successful [a] [b] and influential [c] textbook ever written.

5. Partition of a set - Wikipedia

   en.wikipedia.org/wiki/Partition_of_a_set

   In mathematics, a partition of a set is a grouping of its elements into non-empty subsets, in such a way that every element is included in exactly one subset. Every equivalence relation on a set defines a partition of this set, and every partition defines an equivalence relation.

6. Union (set theory) - Wikipedia

   en.wikipedia.org/wiki/Union_(set_theory)

   If M is a set or class whose elements are sets, then x is an element of the union of M if and only if there is at least one element A of M such that x is an element of A. [11] In symbols: x ∈ ⋃ M ∃ A ∈ M , x ∈ A . {\displaystyle x\in \bigcup \mathbf {M} \iff \exists A\in \mathbf {M} ,\ x\in A.}

7. 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 of some preordered set is an element of that is not smaller than any other element in .

8. Order (group theory) - Wikipedia

   en.wikipedia.org/wiki/Order_(group_theory)

   In mathematics, the order of a finite group is the number of its elements. If a group is not finite, one says that its order is infinite. The order of an element of a group (also called period length or period) is the order of the subgroup generated by the element.

9. Greatest element and least element - Wikipedia

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

   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 of a partially ordered set (poset) is an element of that is greater than every other element of .