An elementary property of the quadratic map over $\mathbb{Q}$
Patrick Morton, Şerban Raianu
Abstract
Patrick Morton, Şerban Raianu
Abstract
It is shown that $c = -29/16$ is the unique rational number with smallest denominator, and the unique rational number of smallest numerator, for which the map $f(x) = x^2 + c$ has a rational cycle with period $3$. Several arithmetic conditions on the set of all such rational numbers $c$ are proved.
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It is shown that $c = -29/16$ is the unique rational number with smallest denominator, and the unique rational number of smallest numerator, for which the map $f(x) = x^2 + c$ has a rational cycle with period $3$. Several arithmetic conditions on the set of all such rational numbers $c$ are proved.
Key concepts: Rational number, Mathematics, Quadratic equation, Property (philosophy), Set (abstract data type), Combinatorics, Discrete mathematics, Arithmetic