Download Count Like an Egyptian: A Hands-on Introduction to Ancient by David Reimer PDF

By David Reimer

The math of old Egypt was once essentially diverse from our math at the present time. opposite to what humans may imagine, it wasn’t a primitive forerunner of contemporary arithmetic. in truth, it can’t be understood utilizing our present computational tools. Count Like an Egyptian provides a enjoyable, hands-on advent to the intuitive and often-surprising artwork of historical Egyptian math. David Reimer courses you step by step via addition, subtraction, multiplication, and extra. He even exhibits you ways fractions and decimals could have been calculated—they technically didn’t exist within the land of the pharaohs. You’ll be counting like an Egyptian very quickly, and alongside the way in which you’ll research firsthand how arithmetic is an expression of the tradition that makes use of it, and why there’s extra to math than rote memorization and bewildering abstraction.

Reimer takes you on a full of life and enjoyable journey of the traditional Egyptian global, delivering wealthy ancient info and a laugh anecdotes as he offers a bunch of mathematical difficulties drawn from diverse eras of the Egyptian prior. every one of those difficulties is sort of a tantalizing puzzle, usually with a gorgeous and chic resolution. As you remedy them, you’ll be immersed in lots of features of Egyptian existence, from hieroglyphs and pyramid construction to agriculture, faith, or even bread baking and beer brewing.
Fully illustrated in colour all through, Count Like an Egyptian also teaches you a few Babylonian computation—the precursor to our glossy system—and compares historic Egyptian arithmetic to today’s math, letting you choose for your self that's larger.

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C O N T I N U U M MODEL Consider an isothermal motion of an infinite homogeneous bar with a unit cross-section. Let u{x^ t) be the displacement of a reference point x at time t. Then strain and velocity fields are given hy w = Ux{x^t) and V — ut{xjt)^ respectively. The balances of mass and Hnear momentum are Vx = wt and pvt = {a{w))x^ where the function a{w) specifies the stress-strain relation. 1a. The two monotonicity regions where a'{w) > 0 will be associated with material phases I and 11. Suppose now that an isolated strain discontinuity propagates along the bar with constant velocity V.

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