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Number Theory: A Very Short IntroductionNumber theory is the branch of mathematics that is primarily concerned with the counting numbers. Of particular importance are the prime numbers, the 'building blocks' of our number system. The subject is an old one, dating back over two millennia to the ancient Greeks, and for many years has been studied for its intrinsic beauty and elegance, not least because several of its challenges are so easy to state that everyone can understand them, and yet
Number theory is the branch of mathematics that is primarily concerned with the counting numbers. Of particular importance are the prime numbers, the 'building blocks' of our number system. The subject is an old one, dating back over two millennia to the ancient Greeks, and for many years has been studied for its intrinsic beauty and elegance, not least because several of its challenges are so easy to state that everyone can understand them, and yet no-one has ever been able to resolve them. But number theory has also recently become of great practical importance - in the area of cryptography, where the security of your credit card, and indeed of the nation's defence, depends on a result concerning prime numbers that dates back to the 18th century. Recent years have witnessed other spectacular developments, such as Andrew Wiles's proof of 'Fermat's last theorem' (unproved for over 250 years) and some exciting work on prime numbers. In this Very Short Introduction Robin Wilson introduces the main areas of classical number theory, both ancient and modern. Drawing on the work of many of the greatest mathematicians of the past, such as Euclid, Fermat, Euler, and Gauss, he situates some of the most interesting and creative problems in the area in their historical context. ABOUT THE SERIES:The Very Short Introductions series from Oxford University Press contains hundreds of titles in almost every subject area. These pocket-sized books are the perfect way to get ahead in a new subject quickly. Our expert authors combine facts, analysis, perspective, new ideas, and enthusiasm to make interesting and challenging topics highly readable.
Binding Type: Paperback
Publisher: Oxford University Press, USA
Published: 08/01/2020
ISBN: 9780198798095
Pages: 176
Weight: 0.30lbs
Size: 6.60h x 4.30w x 0.40d
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Organic Sunscreen with an Air-Brushed Finish
I've been using the Coola Organic sunscreen on my face for about 5 years now. I love that it protects my skin without dangerous chemicals. The product has virtually no scent and has a pleasant creamy, but not greasy, texture. An additional perk is that it creates an instant "air-brushed" looking finish to my skin.
Note: I have found that you have to shake the tube (especially when new) or else the product emerges a bit watery at first.
I've always used the non-tinted formula so I can't comment on how the tinted formula works. Also, the "cooling" aspect of the product seems more of hype than reality. But, over all, this is an excellent sunscreen.
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Reviewed in the United States on April 9, 2021
★★★★★ 5
Gentle but effective
Smooth feel, non skin irritating and my face looks great! Definitely working.
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Reviewed in the United States on May 22, 2025
★★★★★ 5
Good sunscreen
I really like the little bit of glow it gives my face. I’ve used it several times while on the water and it has worked well. I’ve not had any skin irritations.
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Like this!
Finish looks great. The light tint makes for a more even distribution. The smell is pleasant. SPF will help protect the face from the sun. I would purchase this again.
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Reviewed in the United States on April 1, 2026
★★★★★ 5
Replaced 3 products
This is a very good product. Everyday I use CeraVe lightweight 30 or 50 spf and mix Drunk Elephant D-Bronzi and B-Goldi drops for a tint and shimmer. This is the only “makeup” I wear as I don’t like heavy makeup and prefer just a subtle glow with a daily sunscreen. This product effectively replaces all of those products for me. I put this on to try yesterday afternoon and my husband immediately said “Did you do something different? You look good.”
It’s is a little more runny than I expected but applies thinly (as I prefer) and provides just enough tint to cover some of my redness. The glow is beautiful. Love the packaging, the pump is very easy to manage and keep clean.
Too soon to know if it will cause breakouts or how well it holds up in the sun (although my other experiences with SunBum have been that it works well). I will update my review if I have breakouts.
Buy this!
Edited to add: a dermatologist complimented my skin due to this product “your skin looks great, you’re glowing!” I have not had breakouts from using this product. I still use everyday with a little cream blush and mascara and call it good. I stock up when this goes on sale but even when not on sale it is a great price. Still not 100% sure about it’s effectiveness at sun protection although I’m pretty sure it’s better than nothing. Wish this exact product was available in 50 spf. Still a fave!
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Reviewed in the United States on April 6, 2025
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