Orthogonal matrices with rational components in composing tests for High School students
英文摘要：
Fermat Last Theorem, which inspired mathematicians during 300 years, is proved by Andrew Wiles. Even among mathematicians there is a narrow circle of specialists, who can read this proof and understand all details. Is it a reason for pessimism? No, since arithmetics if entire numbers contains broad variety of problems with a simple statement, which might be not less intricate. One of them arises in elementary geometry.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
