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Description
Combinatorics: A Very Short IntroductionHow many possible sudoku puzzles are there? In the lottery, what is the chance that two winning balls have consecutive numbers? Who invented Pascal's triangle? (it was not Pascal) Combinatorics, the branch of mathematics concerned with selecting, arranging, and listing or counting collections of objects, works to answer all these questions. Dating back some 3000 years, and initially consisting mainly of the study of permutations and combinations, its
How many possible sudoku puzzles are there? In the lottery, what is the chance that two winning balls have consecutive numbers? Who invented Pascal's triangle? (it was not Pascal) Combinatorics, the branch of mathematics concerned with selecting, arranging, and listing or counting collections of objects, works to answer all these questions. Dating back some 3000 years, and initially consisting mainly of the study of permutations and combinations, its scope has broadened to include topics such as graph theory, partitions of numbers, block designs, design of codes, and latin squares. In this Very Short Introduction Robin Wilson gives an overview of the field and its applications in mathematics and computer theory, considering problems from the shortest routes covering certain stops to the minimum number of colours needed to colour a map with different colours for neighbouring countries.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: 07/01/2016
ISBN: 9780198723493
Pages: 144
Weight: 0.30lbs
Size: 6.80h x 4.20w x 0.50d
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★★★★★ 4
Good but confusing instructions
It is very glowy. After spraying this on my husband commented on why I was sweating so much 😹 I told him it’s my face mist spf. I have very dry and very sensitive skin and this has not broken me out (yet). I’ve used it for about a week now. I don’t know how much sun protection I’m really getting though. And reapplying it all through out the day, esp in the summer will lead to very very oily looking skin.
It’s also confusing because it says do not spray directly onto face. (?) I just hold my breath and close my eyes tightly before I put my mascara on and spray this. So far it’s been helpful with not making my make up look cakey. There is a smell but it’s not a bad smell, slightly fruity and the smell of spf. If you are sensitive to smells this might not be for you.
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Reviewed in the United States on April 5, 2025
★★★★★ 5
Wonderful!
Item Package Quantity: 1
This makes your skin glow. Smells amazing. I’m older and in my 50s and it is great sun coverage and brightener. I will 100% keep using this.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Great sun protection!
Sun protection factor: 50 Sun Protection Factor (SPF), Size: 6 Ounce (Pack of 2)
My favorite summer sunscreen protection for myself and my kiddos! Smells good and does what it says. Kids are in and out of the water and mom basks in the sun so it protects us all!
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Reviewed in the United States on April 26, 2026
★★★★★ 5
Great sunscreen brand
Sun protection factor: 30 Sun Protection Factor (SPF), Size: 3 Fl Oz (Pack of 2)
We love this brand. It provides the sun protection we are looking for. Easy to apply and it has a pleasant scent.
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Reviewed in the United States on April 11, 2026
★★★★★ 5
smells fresh without being overpowering
Sun protection factor: 30 Sun Protection Factor (SPF), Size: 6 Fl Oz (Pack of 1)
The spray makes it SO easy to apply, especially when you’re in a rush. No white cast, no heavy feeling—just a quick mist and you’re good to go.
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Reviewed in the United States on March 19, 2026