Abstract
The word “geometry”is derived from a greek word meaning “to measure land.”The starting point for differential geometry is the definition of an infinitesimal distance. Generally, such an infinitesimal distance ds is defined in terms of a coordinate system. For the Cartesian coordinate system applied to an n-dimensional Euclidean space, we have
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Notes
- 1.
For a number of years, John J. O’Connor and Edmund F. Robertson have posted profiles at their web site (www-history.mcs.st-and.ac.uk) or google “MacTutor History of Mathematics” on people who have made significant contributions to mathematics. In November 2011, the list of those born between 700 and 1050ad was dominated by members of the Islamic world. Out of a total of 44, 31 or 70% were Arab speaking Muslims. The remaining 13, consists of nine Indians, two Chinese, one Englishman, and one German. Neither the Englishman nor the German is included for making original contributions. The Englishman, Alcuin, is included for preserving the contents of some ancient Greek documents. The German, Hermann of Reichenau, is included for describing some Arabic science in the Latin language.
During the following 50 years (1050–1100), six more people were listed. The six consisted of two Indians, two Spanish Jews, and one English Christian, and only one Arab speaking Muslim. However, it should be noted that the two Spaniards and the Englishman were on the list for their roles in transferring Arab mathematics to the European community.
- 2.
I have discussed this problem in my book Clifford Algebra (Snygg 1997, pp. 137–144 and 154–161). However, the reader should be forewarned of two errors that I made. One, I made the claim that using Clifford algebra, one can write Maxwell’s equations as a single equation. This is clearly not true in the presence of a dielectric. Second, Bernard Jancewicz has pointed out that the approximate magnetic field that I use for Maglich’s Migma Chamber is not a solution of Maxwell’s equation. Nonetheless, the discussion of the two-vector nature of the electro-magnetic field is correct.
References
Durant, Will 1950. The Age of Faith. New York: Simon and Schuster.
Hestenes, David and Garret Sobczyk 1984. Clifford Algebra to Geometric Calculus - A Unified Language for Mathematical Physics. Dordrecht: D. Reidel Publishing Company.
Saliba, George 2007. Islamic Science and the Making of the European Renaissance. Cambridge, Mass: The MIT Press.
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Snygg, J. (2012). Clifford Algebra in Flat n-Space. In: A New Approach to Differential Geometry using Clifford's Geometric Algebra. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-0-8176-8283-5_4
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