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Description
The IrrationalsAn entertaining and enlightening history of irrational numbers, from ancient Greece to the twenty first century. The ancient Greeks discovered them, but it wasn't until the nineteenth century that irrational numbers were properly understood and rigorously defined, and even today not all their mysteries have been revealed. In The Irrationals, the first popular and comprehensive book on the subject, Julian Havil tells the story of irrational numbers and
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.6 ★★★★★
Based on 519 reviews
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Product Reviews
★★★★★ 4
Thin and flimsy
Size: One Size, Color: (001) Black / Black / Reflective
Very flimsy hat
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 18, 2026
★★★★★ 5
Worth the prize
Size: One Size, Color: (001) Black / Black / Reflective
Light and breathable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 14, 2026
★★★★★ 5
Perfect for running, I love this hat.
Size: One Size, Color: (025) Castlerock / Castlerock / Reflective
This hat is perfect for running in, it's very light weight and breathable so it doesn't get annoying or hot when you're running in the sun. It's easy to clean, just a quick hand wash in the sink and it's dry in 30 minutes. I have a very big head and it's fits me great. If you have a very small head it might be a bit big.
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Reviewed in the United States on April 23, 2025
★★★★★ 5
Perfect hat to buy
Size: One Size, Color: (001) Black / Black / Reflective
Perfect fit. Will buy again.
Easily washable. Color doesn’t fade after washing. Perfect for sun protection.
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Reviewed in the United States on September 5, 2025
★★★★★ 3
great
Size: One Size, Color: (001) Black / Black / Reflective
Like it
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Reviewed in the United States on June 1, 2026
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