Diophantine Approximation on Quadratic Polynomials












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Given an integer $a$ which is not a perfect square, I'd like to ask how to perform Diophantine Approximation of $frac{x^2}{y^2}$ to $a$ where $x$ and $y$ are integers. Specifically, integers satisfying $|frac{x^2}{y^2}-a|<epsilon$ are preferred.










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  • Set $y$ to a power of $10$.
    – N74
    Jan 4 at 11:08










  • Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
    – Peter
    Jan 4 at 14:35
















0














Given an integer $a$ which is not a perfect square, I'd like to ask how to perform Diophantine Approximation of $frac{x^2}{y^2}$ to $a$ where $x$ and $y$ are integers. Specifically, integers satisfying $|frac{x^2}{y^2}-a|<epsilon$ are preferred.










share|cite|improve this question






















  • Set $y$ to a power of $10$.
    – N74
    Jan 4 at 11:08










  • Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
    – Peter
    Jan 4 at 14:35














0












0








0







Given an integer $a$ which is not a perfect square, I'd like to ask how to perform Diophantine Approximation of $frac{x^2}{y^2}$ to $a$ where $x$ and $y$ are integers. Specifically, integers satisfying $|frac{x^2}{y^2}-a|<epsilon$ are preferred.










share|cite|improve this question













Given an integer $a$ which is not a perfect square, I'd like to ask how to perform Diophantine Approximation of $frac{x^2}{y^2}$ to $a$ where $x$ and $y$ are integers. Specifically, integers satisfying $|frac{x^2}{y^2}-a|<epsilon$ are preferred.







number-theory approximation diophantine-approximation






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asked Jan 4 at 10:57









Hang WuHang Wu

426210




426210












  • Set $y$ to a power of $10$.
    – N74
    Jan 4 at 11:08










  • Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
    – Peter
    Jan 4 at 14:35


















  • Set $y$ to a power of $10$.
    – N74
    Jan 4 at 11:08










  • Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
    – Peter
    Jan 4 at 14:35
















Set $y$ to a power of $10$.
– N74
Jan 4 at 11:08




Set $y$ to a power of $10$.
– N74
Jan 4 at 11:08












Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
– Peter
Jan 4 at 14:35




Just find a rational approximation $frac{x}{y}$ (for example with the continued fraction method) of $sqrt{a}$. This gives a reasonable approximation of the desired form.
– Peter
Jan 4 at 14:35










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