Abstract
Once we start studying quaternionic analysis we take part in a wonderful experience, full of insights. This ideology is shown, for instance, when we start describing the first results and pursuing the subject, while the amazement lingers on through the elegance and smoothness of the results.
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- 1.
Hamilton called pure imaginary quaternions right quaternions and real numbers scalar quaternions.
- 2.
A skew field is an algebraic structure that satisfies all the properties of a field except for commutativity.
- 3.
For all real angles θ and ϕ, it is easy to check that \(p =\cos \theta \cos \phi i +\cos \theta \sin \phi j +\sin \theta k\) is a square root of \(-1_{\mathbb{H}}\). This gives the set of all the points on the unit sphere in \({\mathbb{R}}^{3}\) and shows that the set of “quaternionic square roots of minus one” has infinitely many square roots.
- 4.
Hamilton called this quantity the tensor of p, but nowadays this concept conflicts with modern usage.
- 5.
It is also known as trigonometric representation of the quaternion p.
- 6.
These matrices are used in physics to describe the angular momentum of elementary particles such as electrons.
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Morais, J.P., Georgiev, S., Sprößig, W. (2014). An Introduction to Quaternions. In: Real Quaternionic Calculus Handbook. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-0622-0_1
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