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In mathematics, a quaternion algebra over a field F is a central simple algebra A over F [1] [2] that has dimension 4 over F.Every quaternion algebra becomes a matrix algebra by extending scalars (equivalently, tensoring with a field extension), i.e. for a suitable field extension K of F, is isomorphic to the 2 × 2 matrix algebra over K.
The Quaternions can be generalized into further algebras called quaternion algebras. Take F to be any field with characteristic different from 2, and a and b to be elements of F; a four-dimensional unitary associative algebra can be defined over F with basis 1, i, j, and i j, where i 2 = a, j 2 = b and i j = −j i (so (i j) 2 = −a b).
In mathematics, an Eichler order, named after Martin Eichler, is an order of a quaternion algebra that is the intersection of two maximal orders. References [ edit ]
The Cayley–Dickson construction is due to Leonard Dickson in 1919 showing how the octonions can be constructed as a two-dimensional algebra over quaternions.In fact, starting with a field F, the construction yields a sequence of F-algebras of dimension 2 n.
Arithmetic Fuchsian groups are a special class of Fuchsian groups constructed using orders in quaternion algebras.They are particular instances of arithmetic groups.The prototypical example of an arithmetic Fuchsian group is the modular group ().
The quaternion group has the unusual property of being Hamiltonian: Q 8 is non-abelian, but every subgroup is normal. [4] Every Hamiltonian group contains a copy of Q 8. [5] The quaternion group Q 8 and the dihedral group D 4 are the two smallest examples of a nilpotent non-abelian group.
The first part explains the Cayley–Dickson construction, [1] [3] which constructs the complex numbers from the real numbers, the quaternions from the complex numbers, and the octonions from the quaternions. Related algebras are also discussed, including the sedenions (a 16-dimensional real algebra formed in the same way by taking one more ...
A quaternion algebra over a field is a four-dimensional central simple-algebra.A quaternion algebra has a basis ,,, where , and =.. A quaternion algebra is said to be split over if it is isomorphic as an -algebra to the algebra of matrices (); a quaternion algebra over an algebraically closed field is always split.