Download e-book for iPad: A Mathematical Tapestry: Demonstrating the Beautiful Unity by Peter Hilton, Jean Pedersen

By Peter Hilton, Jean Pedersen

ISBN-10: 0521128218

ISBN-13: 9780521128216

This easy-to-read e-book demonstrates how an easy geometric suggestion unearths interesting connections and leads to quantity concept, the math of polyhedra, combinatorial geometry, and workforce concept. utilizing a scientific paper-folding method it's attainable to build a customary polygon with any variety of aspects. This notable set of rules has ended in attention-grabbing proofs of yes ends up in quantity idea, has been used to reply to combinatorial questions related to walls of house, and has enabled the authors to acquire the formulation for the quantity of a customary tetrahedron in round 3 steps, utilizing not anything extra advanced than easy mathematics and the main user-friendly aircraft geometry. All of those principles, and extra, demonstrate the wonderful thing about arithmetic and the interconnectedness of its a number of branches. exact directions, together with transparent illustrations, permit the reader to realize hands-on adventure developing those types and to find for themselves the styles and relationships they unearth.

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Extra resources for A Mathematical Tapestry: Demonstrating the Beautiful Unity of Mathematics

Sample text

We’ll wait. Look at your flexagon. Observe that there are subtle differences between the 2 visible faces. 9. Surprisingly, this flexagon can change its shape. 10. Of course, after you have gone from left to right you will need to reverse the moves to get the flexagon back into its original shape. You may wish to practice these procedures until you have a feel for them. Take your time. Then come back and we’ll tell you how to flex your 8-flexagon in ways similar to your procedures with the 6-flexagon.

Ahah! The numbers 2, 4, and 8 are closely related to the sequence 3, 5, and 9. In fact, we see that 3 = 21 + 1 5 = 22 + 1 9 = 23 + 1. 19 Part of a FAT 9-gon, constructed by performing the FAT algorithm on long lines of the U 3 D 3 -tape. 20 The beginning part of the U 3 D 3 -tape. So now we should suspect that if we fold U n D n , we can use that tape to construct regular (2n + 1)-gons. To see that this is true we can give an error-correction proof analogous to that which we gave in the case n = 1.

If we had really started with an angle of exactly 2π 7 continue introducing crease lines by repeatedly folding the tape DOWN TWICE at the top and UP ONCE at the bottom, we get precisely what we want; namely, pairs of adjacent angles, measuring π7 , at equally spaced intervals along the top edge of the tape. 5 Devising the folding scheme to produce FAT 7-gons. number theory – the (2, 1)-folding procedure) and call the strip of creased paper it produces D2 U 1 -tape (or, again more simply, (2, 1)-tape).

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

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