Download Icons of Mathematics: An Exploration of Twenty Key Images by Claudi Alsina, Roger B. Nelsen PDF

By Claudi Alsina, Roger B. Nelsen

The authors current twenty icons of arithmetic, that's, geometrical shapes corresponding to the fitting triangle, the Venn diagram, and the yang and yin image and discover mathematical effects linked to them. As with their prior books (Charming Proofs, When much less is More, Math Made Visual) proofs are visible every time possible.

The effects require not more than high-school arithmetic to understand and lots of of them might be new even to skilled readers. along with theorems and proofs, the booklet includes many illustrations and it provides connections of the icons to the realm outdoor of arithmetic. There also are difficulties on the finish of every bankruptcy, with suggestions supplied in an appendix.

The booklet might be utilized by scholars in classes in challenge fixing, mathematical reasoning, or arithmetic for the liberal arts. it could actually even be learn with excitement via expert mathematicians, because it was once by means of the individuals of the Dolciani editorial board, who unanimously suggest its publication.

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Additional resources for Icons of Mathematics: An Exploration of Twenty Key Images (Dolciani Mathematical Expositions, Volume 45)

Example text

2b. Its diagonal divides it into two congruent right triangles with equal areas. Since the areas of the similarly shaded triangles are the same, the areas ab 0 and a0 b of the white rectangles must also be equal, from which it follows that a0 =a D b 0 =b.

P . a C b/2 sin Â Ä a C b, which establishes the inequality. 6 [Kung, 2008]. 6. Additional proofs using different icons appear in Chapters 13 and 18. , expressions of the form pq C rs. 4. 7b [Priebe and Ramos, 2000]. 7. 2. In the next chapter we present alternative proofs of these identities, as well as proofs of other addition and subtraction formulas for trigonometric functions. 1. 2)? 6). 2. ˛ ˇ/ D cos ˛ cos ˇ C sin ˛ sin ˇ using a rectangular version of the Zhou bi suan jing. 3. Illustrate ja sin t C b cos t j Ä a2 C b 2 for real a; b; t using a rectangular version of the Zhou bi suan jing.

The diagonal ofp p the sphere, and hence d D s 2 C s 2 2 D s 2 C . It now follows that p s D d= 2 C D jAH j, as required. 1. Prove the converse of Thales’ triangle theorem: the hypotenuse of a right triangle is a diameter of its circumcircle. 2. 7, jQS j is the geometric mean of jPQj and jQRj. ✐ ✐ ✐ ✐ ✐ ✐ “MABK018-04” — 2011/6/1 — 17:17 — page 42 — #14 ✐ 42 ✐ CHAPTER 4. 3. Many identities for inverse trigonometric functions are equivalent to identities for trigonometric functions. 4. 20 to derive the double angle formulas for the sine and cosine.

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