J. L. Lehman 
Quadratic Ideal Numbers [EPUB ebook] 
A Computational Method for Binary Quadratic Forms

This book introduces quadratic ideal numbers as objects of study with applications to binary quadratic forms and other topics. The text requires only minimal background in number theory, much of which is reviewed as needed. Computational methods are emphasized throughout, making this subject appropriate for individual study or research at the undergraduate level or above.

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