Theory of numbers

Marsoni

M251S

$29.90

Get it in 3 business days with 1 day shipping. Friday, May 29

Theory of numbers"Theory of Numbers" by George Ballard Mathews is a foundational work in number theory. Written with clarity and precision, the book explores key topics such as divisibility, prime numbers, congruences, quadratic residues, and Diophantine equations. Mathews provides rigorous mathematical proofs while maintaining an accessible style, making it valuable for both students and researchers. Though intended as the first volume of a larger series, this book

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I have bought two of these in different colors. My Yorkie loves them. They’re very interactive even if you don’t put the cover on it they move and if he’s not playing with it, it tends to go into sleep mode.My Yorkie got the cover off the ball within the first two minutes. But he loves the ball. Now bought 2nd ball. The ones with covers don’t work he rips the covers off.

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Reviewed in the United States on October 15, 2025

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Lindsey Newhouse

Birmingham, US

★★★★★ 5

Super Fun

Color: Green

One of the most entertaining things you could buy. The dogs go crazy over it and have so much fun. It's a bit loud on hard floors, but honestly worth it for the laughs. Seems pretty durable too. I have 2 labs; one started out uninterested and the other started off scared of it, but not too long after, they both started going crazy, tossing and carrying it around while it shook.

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Reviewed in the United States on March 21, 2026

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Monica

Dallas, US

★★★★★ 4

Great customer service

Bought this for our dog for Christmas! He loved it! It sadly stopped working shortly after. Recently emailed the product site themselves and they sent a new one that week! Great customer service and great toy!!

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Reviewed in the United States on February 25, 2026

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Ladybug27

Belleville, US

★★★★★ 5

Best Balls Ever!!!

Size: Medium

These are the best balls ever! We have 2 very active ball loving dogs and these bounce very well and they actually hold up with active play and chewing. They still look brand new after daily use for months!

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Reviewed in the United States on May 15, 2026