By Basil Gordon (auth.), Basil Gordon (eds.)

There are many technical and renowned money owed, either in Russian and in different languages, of the non-Euclidean geometry of Lobachevsky and Bolyai, some of that are indexed within the Bibliography. This geometry, also known as hyperbolic geometry, is a part of the mandatory material of many arithmetic departments in universities and lecturers' colleges-a reflec tion of the view that familiarity with the weather of hyperbolic geometry is an invaluable a part of the heritage of destiny highschool lecturers. a lot cognizance is paid to hyperbolic geometry by means of institution arithmetic golf equipment. a few mathematicians and educators interested in reform of the highschool curriculum think that the necessary a part of the curriculum may still contain parts of hyperbolic geometry, and that the non-compulsory a part of the curriculum should still contain an issue on the topic of hyperbolic geometry. I The vast curiosity in hyperbolic geometry is no surprise. This curiosity has little to do with mathematical and medical functions of hyperbolic geometry, because the functions (for example, within the conception of automorphic features) are relatively really good, and usually are encountered through only a few of the numerous scholars who rigorously examine (and then current to examiners) the definition of parallels in hyperbolic geometry and the unique good points of configurations of traces within the hyperbolic airplane. The crucial reason behind the curiosity in hyperbolic geometry is the real truth of "non-uniqueness" of geometry; of the lifestyles of many geometric systems.

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**Extra resources for A Simple Non-Euclidean Geometry and Its Physical Basis: An Elementary Account of Galilean Geometry and the Galilean Principle of Relativity**

**Example text**

The "geometrization" of the facts of plane statics leads to a different but no less interesting geometry which we propose to describe briefly. In statics, given a system of forces, we may move the vector of each force along its line of action,27 add a number of forces applied at the same point using the parallelogram law, or, conversely, decompose a force into the vector sum of several forces applied at the same point. , a pair of noncollinear, parallel, oppositely directed forces of equal magnitude.

16) cannot influence physical laws. Such laws must, therefore, take the same form in either of two coordinate systems {x,y} and {x',y'} connected by the relations x'= xcosa+ysina+a, (6) y'= -xsina+ycosa+b, with a= LxCx', the angle between the axes Ox and O'x', and (a,b) the coordinates of 0 in the new coordinate system. This means that for a proposition to have mechanical significance it must retain its form under the transformations (6). In addition, Galileo's principle of relativity asserts that the description of all mechanical processes relative to coordinates (x,y) or (x',y') is unaffected if the origin and axes of the coordinate system 18We are dealing, essentially, with plane-parallel motions of objects (cf.

Since the vector F is determined by its two coordinates x and y, the set of all possible plane systems of forces is three-dimensional in the sense that each such 27A vector which is restricted to move along a line is called a sliding vector. Thus a system of forces in statics is equivalent to a system of sliding vectors. 2BSee, for example, [23], pp. 241-242. 29See, for example, [23], p. 240. :JOsee, for example, [23], pp. 223-224; or [24], pp. 345-358. 29 2. What is mechanics? 31 If we move the origin of our coordinate system from 0 to O'(a,b) (where a and b are the components of the vector 00' = c; see Fig.