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

By Francis Borceux

Focusing methodologically on these historic elements which are suitable to helping instinct in axiomatic techniques to geometry, the booklet develops systematic and smooth ways to the 3 middle features of axiomatic geometry: Euclidean, non-Euclidean and projective. traditionally, axiomatic geometry marks the foundation of formalized mathematical job. it truly is during this self-discipline that almost all traditionally well-known difficulties are available, the options of that have ended in numerous shortly very lively domain names of study, specifically 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 ended in the emergence of mathematical theories in keeping with an arbitrary method of axioms, a necessary characteristic of up to date mathematics.

This is an engaging publication for all those that train or learn axiomatic geometry, and who're drawn to the historical past of geometry or who are looking to see an entire facts of 1 of the well-known difficulties encountered, yet now not solved, in the course of their reviews: circle squaring, duplication of the dice, trisection of the perspective, building of normal polygons, development of types of non-Euclidean geometries, and so forth. It additionally offers hundreds and hundreds of figures that help intuition.

Through 35 centuries of the heritage of geometry, realize the start and keep on with the evolution of these leading edge principles that allowed humankind to improve such a lot of elements of latest arithmetic. comprehend some of the degrees of rigor which successively demonstrated themselves in the course of the centuries. Be surprised, as mathematicians of the nineteenth century have been, while staring at that either an axiom and its contradiction will be selected as a sound foundation for constructing a mathematical thought. go through the door of this terrific global of axiomatic mathematical theories!

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

Sample text

Eudoxus observed that his axiom on the existence of ratios yields at once the following so-called Exhaustion theorem: Exhaustion theorem If from a given magnitude, one subtracts a part at least equal to half of it, if from the remaining magnitude one subtracts a part at least equal to half of it, and if this process is repeated, one ends up eventually with a magnitude which is smaller than any prescribed magnitude of the same nature. In contemporary terms, ∀n an+1 ≤ an 2 =⇒ lim an = 0. n→∞ The proof is essentially the one we would give today.

This supposes implicitly (in modern language) that the ratio of the measures of two given segments is always a rational number: a fact which we know today to be false. It was perhaps the Pythagorean Hippasus, around 420 BC, who discovered the existence of incommensurable magnitudes: two magnitudes that you cannot possibly measure with the same unit segment. This discovery destroyed a large part of Greek geometry. In any case all results depending on Thales’ theorem, and in particular on the widely used theory of similar triangles, were to be called into question again.

X y 2a The intersection point of the two curves (see Fig. 18) thus yields the expected solution to the “double proportional mean problem”, namely √ √ 3 3 (x, y) = a 2, a 4 . The magnitude x is thus the side of the cube with volume 2a 3 . Menaechmus’ approach to the problem reduces at once the problem of the double proportional mean to the intersection of two parabolas in the plane. This is a major progress compared with the techniques of Archytas. 6 Incommensurable Magnitudes 29 these operations are indeed “constructible” with ruler and compass (see Sect.

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