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Description
Shapes, Space, and Symmetry"Altogether a most instructive, entertaining, and esthetically pleasing book." Science. Since the ancient Greeks, the visualization of space has been a challenge that has intrigued men of learning. Through centuries of thoughtful looking, a number of three dimensional figures or polyhedral, as the Greeks called them, have been discovered, admired, and wondered at for their mathematical elegance and beauty. And they have been put to use in remarkably
"Altogether a most instructive, entertaining, and esthetically pleasing book." -- Science.Since the ancient Greeks, the visualization of space has been a challenge that has intrigued men of learning. Through centuries of thoughtful looking, a number of three-dimensional figures or polyhedral, as the Greeks called them, have been discovered, admired, and wondered at for their mathematical elegance and beauty. And they have been put to use in remarkably diverse ways by engineers and builders, chemists and crystallographers, architects and sculptors.
This book describes very clearly and simply, and illustrates with beautiful photographs of models, a great number of three-dimensional figures, all but a few consisting of plane faces bounded by straight lines. It examines the nine regular solids -- the five commonly called Platonic, described by Theaetetus in the fourth century B.C., and the four called Kepler-Poinsot, two each of which were discovered by Kepler and Poinsot many centuries later. And it examines many variations obtained by truncation, stellation, dualization, and compounding.
Writing for the layman as well as the student or professional in mathematics, Alan Holden explains the structure of the figures and demonstrates how they can be used to explain mathematics visually rather than by symbol systems, an effort hailed by Scientific American magazine as "a victory of clear, connected thinking over the theorematic method." At the end of the book the author includes a section containing instructions for constructing cardboard models.
Binding Type: Paperback
Publisher: Dover Publications
Published: 03/14/2012
ISBN: 9780486268514
Pages: 208
Weight: 0.65lbs
Size: 8.90h x 5.90w x 0.60d
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★★★★★ 5
well-made and should not fall apart as others have.
Style: Sport
Works great. Seems rough but after the first use it softens.
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Reviewed in the United States on January 24, 2026
★★★★★ 5
Excellent pouch.
Style: Sport
Pouch is excellent for preserving soap and avoiding mess.
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Reviewed in the United States on February 28, 2026
★★★★★ 5
Smooth as a Kazakh Goat's Milk! Very Nice!
Style: Sport
Wa wa wee wa! I recently use the Cleanlogic Soap Saver Exfoliator, and let me tell you, it is very nice! My wife, she say my skin now feel like a silky milk of a Kazakhstani goat, yes? The exfoliator, it rubs away the dirt like it owes money to my brother Bilo! The soap saver is genius—no more dropping soap like slippery American politician drop the truth! You put the soap in, scrub-a-dub, and poof! Clean like a baby after his first bath in the glorious Aral Sea (before it disappear, very sad).
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Reviewed in the United States on September 3, 2024
★★★★★ 3
Very nice
Style: Sport
My husband and I both enjoy these soap savers. We don't find them to be too abrasive and I have sensitive skin. It dries between uses and works as expected.
Unfortunately, we met a quality issue when the thinner side of his soap bag ripped within a month. Disappointing. I've deducted 2 stars for this reason.
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Reviewed in the United States on June 21, 2025
★★★★★ 5
Great value!
Perfect fit for Dr. Pen. Each is sealed separately. Great value
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Reviewed in the United States on January 29, 2026