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Struct/The binary quadratic form x^2 + xy - 2y^2
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Title: The binary quadratic form x^2 + xy - 2y^2
Consider the integer-valued binary quadratic form:
$$Q(x,y) = x^2 + xy - 2y^2.$$
The discriminant of $Q$ is 9.
The range topograph of $Q$ has two lakes joined by a river.
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