By Peter Hilton, Jean Pedersen, Sylvie Donmoyer

ISBN-10:

ISBN-13: 1397805217641

ISBN-10: 0521764106

ISBN-13: 9780521764100

This easy-to-read ebook demonstrates how an easy geometric notion unearths attention-grabbing connections and ends up in quantity concept, the maths of polyhedra, combinatorial geometry, and team concept. utilizing a scientific paper-folding technique it's attainable to build a standard polygon with any variety of aspects. This extraordinary set of rules has ended in fascinating proofs of yes ends up in quantity thought, has been used to reply to combinatorial questions related to walls of area, and has enabled the authors to acquire the formulation for the quantity of a standard tetrahedron in round 3 steps, utilizing not anything extra advanced than simple mathematics and the main ordinary aircraft geometry. All of those rules, and extra, demonstrate the wonderful thing about arithmetic and the interconnectedness of its numerous branches. distinct directions, together with transparent illustrations, let the reader to achieve hands-on adventure developing those types and to find for themselves the styles and relationships they unearth.

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**Additional info for A Mathematical Tapestry: Demonstrating the Beautiful Unity of Mathematics**

**Sample text**

When this last angle is bisected twice by folding the tape down, the two acute angles nearest the top edge of the tape will each measure π7 + 23 . This makes it clear that, every time we repeat a D 2 U 1 -folding on the tape, the error is reduced by a factor of 23 . We see that our optimistic strategy has paid off – by blandly assuming we have an angle of 2π at the top of the tape to begin with, and folding accordingly, we get 7 what we want – successive angles at the top of the tape which, as we fold, rapidly get closer and closer to π7 , whatever angle we had, in fact, started with!

1 What is the difference between (a) and (b)? 2 A square with a corner folded down. cannot be carried out with inappropriate materials. Exercise your own initiative in choosing which models to make but not in your choice of material (except within very narrow limits). 1. Do you see a difference? If not, look again! Notice that in (a) the portion of the strip going in the downward direction is on top of the horizontal part of the strip; whereas in (b) that portion is underneath the horizontal part of the strip.

B − 1, then the top b of the tape will have turned through an angle of 2aπ . Thus the vertex Abk will come into coincidence with A0 ; and the top edge of the tape will have visited every ath vertex of a bounding regular convex b-gon, thus determining a regular star b -gon. 21, a = 2 and b = 9. a As was touched on in Chapter 2, we are making a slight adaptation of the Coxeter notation for star polygons (see [8]), so that when we refer to a regular star ab -gon we mean a connected sequence of edges that visits every ath vertex of a regular convex b-gon.

### A Mathematical Tapestry: Demonstrating the Beautiful Unity of Mathematics by Peter Hilton, Jean Pedersen, Sylvie Donmoyer

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