Topology of Numbers · Problem 4.2.7

Classification of Quadratic Forms — Allen Hatcher

Mathematics — Number Theory · continued-fraction-sqrt21

Problem

Compute the continued fraction for 21\sqrt{21} using the form x2−21y2x^2 - 21y^2. Can you explain the relationship between this continued fraction and the one for 7/3\sqrt{7/3} computed in this section?

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