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Many properties of a group – such as whether or not it is abelian, which elements are inverses of which elements, and the size and contents of the group's center – can be discovered from its Cayley table. A simple example of a Cayley table is the one for the group {1, −1} under ordinary multiplication:
Thus, normalizing a Cayley table (putting the border headings in some fixed predetermined order by permuting rows and columns including the headings) preserves the isotopy class of the associated Latin square. Furthermore, if two normalized Cayley tables represent isomorphic quasigroups then their associated Latin squares are also isomorphic.
Cayley table as general (and special) linear group GL(2, 2) In mathematics, D 3 (sometimes alternatively denoted by D 6) is the dihedral group of degree 3 and order 6. It equals the symmetric group S 3. It is also the smallest non-abelian group. [1] This page illustrates many group concepts using this group as example.
The following Cayley table shows the effect of composition in the group D 3 (the symmetries of an equilateral triangle). r 0 denotes the identity; r 1 and r 2 denote counterclockwise rotations by 120° and 240° respectively, and s 0, s 1 and s 2 denote reflections across the three lines shown in the adjacent picture.
A Cayley graph of the symmetric group S 4 using the generators (red) a right circular shift of all four set elements, and (blue) a left circular shift of the first three set elements. Cayley table, with header omitted, of the symmetric group S 3. The elements are represented as matrices. To the left of the matrices, are their two-line form.
In the example of symmetries of a square, the identity and the rotations constitute a subgroup = {,,,} , highlighted in red in the Cayley table of the example: any two rotations composed are still a rotation, and a rotation can be undone by (i.e., is inverse to) the complementary rotations 270° for 90°, 180° for 180°, and 90° for 270°.
The Cayley table of the group can be derived from the group presentation , = =, = . A different Cayley graph of D 4 {\displaystyle D_{4}} is shown on the right. b {\displaystyle b} is still the horizontal reflection and is represented by blue lines, and c {\displaystyle c} is a diagonal reflection and is represented by pink lines.
This is an example of a non-abelian group: the operation ∘ here is not commutative, which can be seen from the table; the table is not symmetrical about the main diagonal. There are five different groups of order 8. Three of them are abelian: the cyclic group C 8 and the direct products of cyclic groups C 4 ×C 2 and C 2 ×C 2 ×C 2.