By Leonard Mlodinow

ISBN-10: 0684865238

ISBN-13: 9780684865232

** Flatbed experiment: 2 publication pages = 1 dossier web page, no OCR**

via *Euclid's Window* Leonard Mlodinow brilliantly and delightfully leads us on a trip via 5 revolutions in geometry, from the Greek inspiration of parallel traces to the most recent notions of hyperspace. here's an altogether new, clean, substitute background of math revealing how uncomplicated questions an individual may ask approximately area -- within the lounge or in another galaxy -- were the hidden engine of the top achievements in technological know-how and expertise.

Mlodinow unearths how geometry's first revolution all started with a "little" scheme hatched by way of Pythagoras: the discovery of a process of summary ideas which could version the universe. That modest proposal used to be the root of medical civilization. yet extra strengthen used to be halted while the Western brain nodded off into the darkish a while. ultimately within the fourteenth century an imprecise bishop in France invented the graph and heralded the subsequent revolution: the wedding of geometry and quantity. Then, whereas intrepid mariners have been crusing from side to side around the Atlantic to the hot global, a fifteen-year-old genius discovered that, just like the earth's floor, house can be curved. may well parallel traces rather meet? may well the angles of a triangle relatively upload as much as extra -- or much less -- than one hundred eighty levels? The curved-space revolution reinvented either arithmetic and physics; it additionally set the degree for a patent workplace clerk named Einstein so as to add time to the size of area. His nice geometric revolution ushered within the sleek period of physics.

this present day we're in the course of a brand new revolution. At Caltech, Princeton, and universities all over the world, scientists are spotting that each one the numerous and wondrous forces of nature may be understood via geometry -- a unusual new geometry. it's a exciting math of additional, twisted dimensions, within which house and time, subject and effort, are all intertwined and published as results of a deep, underlying constitution of the universe.

according to Mlodinow's vast ancient learn; his reports along colleagues akin to Richard Feynman and Kip Thorne; and interviews with top physicists and mathematicians corresponding to Murray Gell-Mann, Edward Witten, and Brian Greene, *Euclid's Window* is a rare mix of rigorous, authoritative research and available, good-humored storytelling that makes a stunningly unique argument announcing the primacy of geometry. if you have seemed via *Euclid's Window,* no area, no factor, and no time will ever be really an analogous.

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**Additional resources for Euclid's Window: The Story of Geometry from Parallel Lines to Hyperspace**

**Sample text**

Then the directional derivative function f (x; ·) : Rn → R is sublinear. Proof Let u ∈ Rn \ {o}. 5 Convex functions 25 and τ ↓ 0 gives f (x; λu) = λ f (x; u). For u, ∈ Rn the convexity of f yields f (x + τ(u + )) = f ≤ 1 2 1 2 (x + 2τu) + 12 (x + 2τ ) f (x + 2τu) + 12 f (x + 2τ )), hence f (x + 2τu) − f (x) f (x + 2τ ) − f (x) f (x + τ(u + )) − f (x) ≤ + τ 2τ 2τ for τ > 0, and τ ↓ 0 gives f (x; u + ) ≤ f (x; u) + f (x; ). Let f : Rn → R be a sublinear function. The condition f (−u) = − f (u) is necessary and suﬃcient in order that f be linear on the subspace lin{u}, and in this case we say that u is a linearity direction of f .

Occasionally we shall have to use support and separation of convex cones. 9 Let C ⊂ Rn be a closed convex cone. Each support plane of C contains o. If x ∈ Rn \ C, then there exists a vector u ∈ Rn such that c, u ≥ 0 for all c ∈ C and x, u < 0. Proof Let H be a support plane to C. There is a point y ∈ H ∩ C. Then λy ∈ C for all λ > 0, which is impossible if o H. Hence o ∈ H. 1. 14 Basic convexity We shall now prove two more results in the spirit of the theorems of Carath´eodory and Helly. They are treated in this section since the first of them needs support planes in its proof and the second one deals with separation.

Hu,α A flat E supports A at x if x ∈ A ∩ E and E lies in some support plane of A. 1 Let A ⊂ Rn be nonempty, convex and closed and let x ∈ Rn \ A. The hyperplane H through p(A, x) orthogonal to u(A, x) supports A. 1 (with p(A, y) replaced by z) gives x − p(A, x), ≤ 0. This yields the assertion. 2 Let A ⊂ Rn be convex and closed. Then through each boundary point of A there is a support plane of A. If A ∅ is bounded, then to each vector u ∈ Rn \ {o} there is a support plane to A with outer normal vector u.

### Euclid's Window: The Story of Geometry from Parallel Lines to Hyperspace by Leonard Mlodinow

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