By Francis Borceux

ISBN-10: 3319017306

ISBN-13: 9783319017303

Focusing methodologically on these old elements which are proper to aiding instinct in axiomatic methods to geometry, the ebook develops systematic and glossy techniques to the 3 middle points of axiomatic geometry: Euclidean, non-Euclidean and projective. traditionally, axiomatic geometry marks the foundation of formalized mathematical job. it's during this self-discipline that the majority traditionally recognized difficulties are available, the options of that have ended in numerous almost immediately very energetic domain names of analysis, in particular in algebra. the popularity of the coherence of two-by-two contradictory axiomatic structures for geometry (like one unmarried parallel, no parallel in any respect, a number of parallels) has resulted in the emergence of mathematical theories in accordance with an arbitrary method of axioms, an important function of latest mathematics.

This is an interesting ebook for all those that train or learn axiomatic geometry, and who're attracted to the historical past of geometry or who are looking to see a whole evidence of 1 of the recognized difficulties encountered, yet no longer solved, in the course of their stories: circle squaring, duplication of the dice, trisection of the perspective, building of normal polygons, building of types of non-Euclidean geometries, and so on. It additionally offers 1000's of figures that aid intuition.

Through 35 centuries of the background of geometry, become aware of the start and stick with the evolution of these cutting edge principles that allowed humankind to boost such a lot of features of up to date arithmetic. comprehend a few of the degrees of rigor which successively demonstrated themselves throughout the centuries. Be surprised, as mathematicians of the nineteenth century have been, while looking at that either an axiom and its contradiction might be selected as a sound foundation for constructing a mathematical thought. go through the door of this excellent international of axiomatic mathematical theories!

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Additional resources for An Axiomatic Approach to Geometry (Geometric Trilogy, Volume 1)

Example text

The lines are some specified subsets of points satisfying some axioms (through two distinct points passes exactly one line, and so on). Besides the properties described by the axioms, nothing else is said about lines, their “shape” is not described. Like most persons today, the Greek geometers could not imagine studying something which has not been explicitly and precisely defined. A list of axioms does not tell you the precise nature of the lines (just as the axioms for a vector space do not reveal the precise nature of the vectors: pairs of numbers, continuous functions, matrices, .

Of course “infinite magnitudes” were not considered as “magnitudes”, and certainly Greek geometers were not aware of the pathological “magnitudes” which escape measure theory. Notice that since surpasses means strictly bigger, this definition excludes at once “zero magnitudes”. It also excludes magnitudes of different natures (for example, a length and an area) since one cannot compare multiples of such magnitudes. Eudoxus then introduces the following axiom: Eudoxus’ axiom Two non-zero magnitudes of the same nature always have a ratio.

The segment cannot “cross” the line without “meeting” the line. Today, this is a consequence of what we call the continuity axiom (see Sect. 4 for a precise treatment). 2), but no axiom concerning it is given: continuity is considered as a primitive notion, inherent to the nature of space. However, the comments above on the “continuity of space” indicate the importance of a clear notion of continuity to ensure the validity of some basic results. From the very beginning, Greek philosophers payed great attention to this point.

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An Axiomatic Approach to Geometry (Geometric Trilogy, Volume 1) by Francis Borceux


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