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Description
SymmetrySymmetry is a classic study of symmetry in mathematics, the sciences, nature, and art from one of the twentieth century's greatest mathematicians. Hermann Weyl explores the concept of symmetry beginning with the idea that it represents a harmony of proportions, and gradually departs to examine its more abstract varieties and manifestations as bilateral, translatory, rotational, ornamental, and crystallographic. Weyl investigates the general abstract
Symmetry is a classic study of symmetry in mathematics, the sciences, nature, and art from one of the twentieth century's greatest mathematicians. Hermann Weyl explores the concept of symmetry beginning with the idea that it represents a harmony of proportions, and gradually departs to examine its more abstract varieties and manifestations--as bilateral, translatory, rotational, ornamental, and crystallographic. Weyl investigates the general abstract mathematical idea underlying all these special forms, using a wealth of illustrations as support. Symmetry is a work of seminal relevance that explores the great variety of applications and importance of symmetry.
-- "Scientific American"Binding Type: Paperback
Publisher: Princeton University Press
Published: 10/04/2016
ISBN: 9780691173252
Pages: 176
Weight: 0.55lbs
Size: 8.40h x 5.40w x 0.60d
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4.8 ★★★★★
Based on 673 reviews
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Product Reviews
★★★★★ 5
Good steamer and brand name.
Style: Steam Starter
I gave 4 stars as Shark Steamer mop S1000 is a good product. My last one was the purple steam mop and lasted 15 years. It was used at least once a week on all floors and for mess. It has the power steam and wipe the dirt away. Fast and easy. I have sealed hard wood floors, lots of tile, have always had two large dogs and one messy spouse who seams to drop everything on the kitchen floor, and brings in mud. (The dogs are cleaner). Needless to say, it gets good use. Fill the tank, wait as instructions say 2-3 minutes, you will hear the steam and it ready. I like the washable pads and ordered six extra to have them on had. The last was you had to fill the tank, not removable. This new one has a removable tank which I like the idea. Easy to dump out any water remain to let dry. However, maybe because it’s new, I find the tank is a bit hard to remove, the instructions say to pull up and out. You have to just pull out. The button under the tank on the machine its self does push in to allow the tank to snap back into place, but to remove it takes a little figure power to pull out. It needs a tank release button to make easier for arthritis hands. But I am still sticking with this machine and brand, hope it does me just as well as the last one.
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Reviewed in the United States on February 1, 2026
★★★★★ 4
A good beginning Steam Mop for the price
Style: Steam Starter
I have been curious about Steam Mops for awhile now and thought for the price - why not? Pros: Price and general quality of product; simplicity of the "mechanics" of a steam mop, and watching the steam actually come out of the body of the mop into the pad; I've cleaned a few pretty dirty surfaces; but no tile grout areas like some of the impressive videos; generally I suppose I have a sense that I am REALLY cleaning something cause there's steam! Maybe it's just a mind thing you know the power of suggestion. Cons: cord could be longer; and the element that you fill with water is a little sticky to actually remove; it's almost as if you feel like your going to break something by having to 'force' the water bottle away from the mop; every time I do this - I still feel I may break it. Also; the pad to clean the floor with is large with most of the steam actually exiting right in the middle - so I have found myself using a basic "floor cleaner" from a squeeze bottle in order to actually feel like I am getting my floors extra clean. I don't put anything other than water in the water-bottle for the mop - without the use of anything else; the floors do appear cleaned - and evidenced by the dirt on the pad. I might suggest purchasing a few extra pads so you can keep them clean. I toss mine in the wash - seems to work.
Conclusion: I would recommend this model mostly for those who just want to give the ole' steam mop craze a try; you can't beat the price for a basic-simple model.
I may upgrade one day but for now - this works fine.
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Reviewed in the United States on June 14, 2022
★★★★★ 5
Simple and effective.
Style: Steam Starter
I'm glad I purchased this model. I previously had a more complex model with the detachable steamer. Eventually the steamer would no longer attach to the handle, the mechanism wore out. This one is super simple. Put water in. Push down to make steam. It gives off plenty of steam. I'm confident that my floors are getting clean and there are no frills to get in the way of productivity. I will be purchasing more pads, as others have recommended.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Buy it and you’ll be happy that you did!
Style: Steam Starter
I bought this for my fifth wheel trailer and it is wonderful! I love how easy it is to use on floors. It saves me time as it dries quickly. I actually mix some floor cleaner in with the water and it leaves a nice clean smell. I can plug it in to one outlet and do the bathroom as well as the living room floors because it has a nice length to the cord. It has no leaks and is the perfect size to fit in my front closet. Best steam mop by far!
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Reviewed in the United States on April 18, 2026
★★★★★ 5
CLEAN at last!
Style: Steam Starter
This is WONDERFUL! My kitchen floor is a dark, swirly stone pattern tile and it never felt truly CLEAN before... now it does... grateful for steam!
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Reviewed in the United States on June 3, 2026
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