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There are at least two ways of representing quaternions as matrices in such a way that quaternion addition and multiplication correspond to matrix addition and matrix multiplication. One is to use 2 × 2 complex matrices, and the other is to use 4 × 4 real matrices. In each case, the representation given is one of a family of linearly related ...
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 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.
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.
q+1,p of the algebra Cl q+1,p (), which can be used to parametrise rotations in the larger algebra. There is thus a close connection between complex numbers and rotations in two-dimensional space; between quaternions and rotations in three-dimensional space; between split-complex numbers and (hyperbolic) rotations ( Lorentz transformations ) in ...
In mathematics, quaternionic analysis is the study of functions with quaternions as the domain and/or range. Such functions can be called functions of a quaternion variable just as functions of a real variable or a complex variable are called.
A rotor is an object in the geometric algebra (also called Clifford algebra) of a vector space that represents a rotation about the origin. [1] The term originated with William Kingdon Clifford, [2] in showing that the quaternion algebra is just a special case of Hermann Grassmann's "theory of extension" (Ausdehnungslehre). [3]
W. R. Hamilton introduced quaternions [10] [11] in 1843, and by 1873 W. K. Clifford obtained a broad generalization of these numbers that he called biquaternions, [12] [13] which is an example of what is now called a Clifford algebra. [3] In 1898 Alexander McAulay used Ω with Ω 2 = 0 to generate the dual quaternion algebra. [14]