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Benedict Irwin edited section_Fermat_Like_Problem_Observing__.tex
over 8 years ago
Commit id: 3d6616a751914e51babfe6dda73433c0b69912c7
deletions | additions
diff --git a/section_Fermat_Like_Problem_Observing__.tex b/section_Fermat_Like_Problem_Observing__.tex
index 3d11d7d..b3920c2 100644
--- a/section_Fermat_Like_Problem_Observing__.tex
+++ b/section_Fermat_Like_Problem_Observing__.tex
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can be expressed as equivalence of a term in the expansions \begin{equation}
\frac{2}{
x+\frac{\frac{a+b}{2}}{
x+\frac{\frac{(a-b)^2}{a+b}}{ x+\frac{\frac{(a-b)^2}{2(a+b)}}{
x+\frac{\frac{2ab}{a+b}}{
x}}}} \Leftrightarrow \frac{1}{x+\frac{c}{x}}
\end{equation}
which represents the equivalence (as $x\to\infty$) \begin{equation}
\frac{a^0+b^0}{x}-\frac{a^1+b^1}{x^3}+\frac{a^2+b^2}{x^5}-\cdots = \frac{c^0}{x}-\frac{c^1}{x^3}+\frac{c^2}{x^5}-\cdots
\end{equation}
The basic comparison is then \begin{equation}
(n=0)\;\;\;\lim_{x\to\infty} 2=1\;\;\;(\mathrm{no solution})
\end{equation}
then we have \begin{equation}
\frac{2x}{
x+\frac{\frac{a+b}{2}}{
x+\frac{\frac{(a-b)^2}{a+b}}{
x+\frac{\frac{2ab}{a+b}}{
x}}}} -2 \Leftrightarrow \frac{x}{x+\frac{c}{x}} -1
\end{equation}
which represents the equivalence (as $x\to\infty$) \begin{equation}
-\frac{a^1+b^1}{x^2}+\frac{a^2+b^2}{x^4}-\cdots = -\frac{c^1}{x^2}+\frac{c^2}{x^4}-\cdots
\end{equation}
for this we only have solutions $b=-a,c=0$ and $b=a,c=2a$. We perform the next step and solve
\begin{equation}
\lim_{x\to\infty}\left[
\frac{2x^5}{
x+\frac{\frac{a+b}{2}}{
x+\frac{\frac{(a-b)^2}{a+b}}{
x+\frac{\frac{2ab}{a+b}}{
x}}}} -2x^4 + ax^2 + bx^2 -\frac{x^5}{x+\frac{c}{x}} +x^4 -cx^2 \right]=0
\end{equation}
This has solutions \begin{equation}
b=-a,\;c=0\\
\end{equation}