By Claudi Alsina, Roger B. Nelsen

ISBN-10: 1614442010

ISBN-13: 9781614442011

Theorems and their proofs lie on the middle of arithmetic. In talking of the merely aesthetic traits of theorems and proofs, G. H. Hardy wrote that during attractive proofs 'there is a really excessive measure of unexpectedness, mixed with inevitability and economy'. fascinating Proofs offers a set of exceptional proofs in undemanding arithmetic which are really based, filled with ingenuity, and succinct. by way of a stunning argument or a strong visible illustration, the proofs during this assortment will invite readers to benefit from the fantastic thing about arithmetic, and to enhance the power to create proofs themselves. The authors ponder proofs from subject matters resembling geometry, quantity conception, inequalities, aircraft tilings, origami and polyhedra. Secondary university and college academics can use this publication to introduce their scholars to mathematical splendor. greater than one hundred thirty workouts for the reader (with options) also are integrated.

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**Sample text**

Fibonacci numbers everywhere Leonardo of Pisa (circa 1170–1240) may not have known that he would be called Fibonacci (a contraction of filius Bonaccio, son of Bonaccio), and he certainly never dreamt that his sequence 1, 1, 2, 3, 5, . . , which he introduced in a problem about counting rabbits, would become such a celebrated sequence of integers. The journal The Fibonacci Quarterly, first published in 1963, is devoted to the study of the properties of this sequence. ) as well as in architecture and design.

12 Show that lim D . 13 Which is larger, e or e ? 14 (a) Show that a rational number to an irrational power may be irrational. (b) Show that a rational number to an irrational power may be rational. (c) Why do we not ask about an irrational number to a rational power? n C 1/. As a consequence, it converges very slowly to . 1 C 1 C 4k/=2. ] ✐ ✐ ✐ ✐ ✐ ✐ “MABK014-03” — 2010/7/13 — 8:26 — page 39 — #1 ✐ CHAPTER ✐ 3 Points in the Plane Mighty is geometry; joined with art, resistless. Euripedes Geometry is the art of correct reasoning on incorrect figures.

However, as a practical method for obtaining a decimal approximation to this experiment is useless. It would take over 10,000 tosses of the needle to obtain even the first decimal place of with 95% confidence [Gridgeman, 1960]. The solution to Buffon’s needle problem is an example of geometric probability and was a starting point for the field where geometry and probability meet—integral geometry. 7 e as a limit There are a variety of ways to define the number e. 1 C 1=n/n . To justify this, we must show ✐ ✐ ✐ ✐ ✐ ✐ “MABK014-02” — 2010/7/10 — 13:30 — page 30 — #12 ✐ 30 ✐ CHAPTER 2.

### Charming Proofs: A Journey into Elegant Mathematics (Dolciani Mathematical Expositions) by Claudi Alsina, Roger B. Nelsen

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