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During the last decade GA has started spreading to engineering and computer science with applications to robotics, computer vision, space flight navigation and control, collision detection, optical design and much more. 33–35 This lively use of GA in the research domain has convinced me at last that it is time to press for GA in the physics curriculum. B. GA in the physics curriculum. At most universities it is easy to introduce GA into graduate courses, given the autonomy for structuring the course that professors enjoy.

We can conclude, therefore, that spin was originally introduced into quantum mechanics with the factor i ¯h in the original Schroedinger equation. Spin components sk = s · σ 3 = sσ 3 are related to conventional matrix elements by ρsk = ¯ h ¯ h ¯h σ k ψσ 3 ψ † = Tr (σ k ΨΨ† ) = Ψ† σ k Ψ, 2 2 2 (92) where the scalar part M of a real multivector M corresponds to the Trace Tr (M ) of its matrix representation. In conventional Pauli theory,31 the σ k are regarded as “spin operators” with eigenvalues corresponding to results of spin measurements in orthogonal directions.

Besides, I must confess to an abiding interest in pure mathematics for its own sake. I consider myself equal parts mathematician and physicist. 18 This result has been independently discovered by several others, and mathematicians have developed it in recent years into a vigorous new branch of mathematics called Clifford analysis. Unfortunately, most practitioners in this field pay insufficient attention to the geometric meaning of their results that is needed for easy application to physics. 29 The development of Geometric Calculus culminated in the 1986 publication of a comprehensive mathematics monograph19 and has continued to this day.

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