SPALDING, K. and VESELOV, A.P., 2018. Conway river and Arnold sail. Arnold Mathematical Journal, 4 (2), pp.169–177
We establish a simple relation between two geometric constructions in number theory: the Conway river of a real indefinite binary
quadratic form and the Arnold sail of the corresponding pair of lines.
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The work of K.S. was supported by the EPSRC as part of PhD study at Loughborough