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src/others/pells_equation.md

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@@ -21,14 +21,6 @@ The first part $( x + \sqrt{d} \cdot y )$ is always greater than 1. And the seco
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We will prove that all solutions to Pell's equation are given by powers of the smallest positive solution. Let's assume it to be
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$ x_{0} + y_{0} \cdot \sqrt{d} $
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[//]: # (We claim that every solution to the equation is given by $ (x_{0} + y_{0} \cdot \sqrt{d})^{n} $ for some integer $ n $. The idea is that any other solution)
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[//]: # ( $ ( x + \sqrt{d} \cdot y )$ must be of this form, meaning that all solutions are generated by repeated multiplication of the smallest solution. Here we use Brahmagupta's identity of quadratic decomposition.)
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[//]: # ( $ (a^{2} - n \cdot b^{2}) \cdot (c^{2} - n \cdot d^{2}) = (a \cdot c + n \cdot b \cdot d)^{2} - n \cdot (a \cdot d + b \cdot c)^{2}$)
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[//]: # ( )
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[//]: # (Here, $a = x_{1}$, $b = y_{1}$, $c = x_{2}$, $d = y_{2}$)
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[//]: # ( So if (x_{1}, y_{1}) and (x_{2}, y_{2}) are solutions, then $(x_{1} \cdot x_{2} + n \cdot y_{1} \cdot y_{2}, x_{1} \cdot y_{2} + y_{1} \cdot x_{2})$ is also a solution.)
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[//]: # (First, we prove that product of two solutions is also a solution.)
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We use method of descent to prove it. suppose there is a solution $u + v \cdot \sqrt{d}$ such that $u^{2} - d \cdot v^{2} = 1 $
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Therefore, $ ( x_{0} + \sqrt{d} \cdot y_{0} )^{n} < u + v \cdot \sqrt{d} < ( x_{0} + \sqrt{d} \cdot y_{0} )^{n+1} $
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