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...02_coefficients_via_system_of_equations/coefficients_via_system_of_equations_example2.tex
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For $m=2$ we have an identity | ||
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\begin{examp} | ||
Let be fixed $m=2$ so that we have the following relation defined by (eqref) | ||
\begin{equation*} | ||
\coeffA{m}{0} n | ||
+ \coeffA{m}{1} \left[ \frac{1}{6} (-n + n^3) \right] | ||
+ \coeffA{m}{2} \left[ \frac{1}{30} (-n + n^5) \right] - n^5 = 0 | ||
\end{equation*} | ||
\end{examp} | ||
Multiplying by $30$ both, right hand side and left hand side, we get | ||
\begin{equation*} | ||
\coeffA{m}{0} n | ||
+ \coeffA{m}{1} \left[ \frac{1}{6} (-n + n^3) \right] | ||
+ \coeffA{m}{2} \left[ \frac{1}{30} (-n + n^5) \right] - n^5 = 0 | ||
30 \coeffA{2}{0} n + 5 \coeffA{2}{1} (-n + n^3) + \coeffA{2}{2} (-n + n^5) - 30n^5 = 0 | ||
\end{equation*} | ||
Multiplying by 30 both parts we get | ||
Opening brackets and rearranging the terms gives | ||
\begin{equation*} | ||
30 \coeffA{m}{0} n | ||
+ 5 \coeffA{m}{1} (-n + n^3) | ||
+ \coeffA{m}{2} (-n + n^5) - 30 n^5 = 0 | ||
30 \coeffA{2}{0} - 5 \coeffA{2}{1} n + 5 \coeffA{2}{1} n^3 - \coeffA{2}{2} n + \coeffA{2}{2} n^5 - 30n^5 = 0 | ||
\end{equation*} | ||
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Opening brackets gives | ||
Combining the terms yields | ||
\begin{equation*} | ||
30 \coeffA{m}{0} n -5 \coeffA{m}{1} n + 5 \coeffA{m}{1} n^3 -\coeffA{m}{2} n + n^5 \coeffA{m}{2} n^5 - 30 n^5 = 0 | ||
n (30 \coeffA{2}{0} - 5 \coeffA{2}{1} - \coeffA{2}{2}) + 5 \coeffA{2}{1} n^3 + n^5 (\coeffA{2}{2} - 30) = 0 | ||
\end{equation*} | ||
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Arranging terms we get | ||
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Therefore, the system of linear equations follows | ||
\begin{equation*} | ||
n (30 \coeffA{m}{0} n - 5 \coeffA{m}{1} -\coeffA{m}{2}) + 5 \coeffA{m}{1} n^3 + n^5 (\coeffA{m}{2} n^5 - 30) = 0, \quad n \geq 1 | ||
\begin{cases} | ||
30 \coeffA{2}{0} - 5 \coeffA{2}{1} - \coeffA{2}{2} = 0 \\ | ||
\coeffA{2}{1} = 0 \\ | ||
\coeffA{2}{2} - 30 = 0 | ||
\end{cases} | ||
\end{equation*} | ||
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Hence | ||
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Solving it we get | ||
\begin{equation*} | ||
\begin{cases} | ||
\coeffA{m}{1} = 0 \\ | ||
\coeffA{m}{2} n^5 - 30 = 0 \\ | ||
30 \coeffA{m}{0} n - 5 \coeffA{m}{1} -\coeffA{m}{2} = 0 | ||
\coeffA{2}{2} = 30 \\ | ||
\coeffA{2}{1} = 0 \\ | ||
\coeffA{2}{0} = 1 | ||
\end{cases} | ||
\end{equation*} | ||
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So that $\coeffA{m}{1}=6 \quad \coeffA{m}{1} = 1$ | ||
\end{equation*} |
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\begin{examp} | ||
Let be fixed $m=3$ so that we have the following relation defined by (eqref) | ||
\begin{equation*} | ||
\coeffA{m}{0} n | ||
+ \coeffA{m}{1} \left[ \frac{1}{6} (-n + n^3) \right] | ||
+ \coeffA{m}{2} \left[ \frac{1}{30} (-n + n^5) \right] | ||
+ \coeffA{m}{3} \left[ \frac{1}{420} (-10 n + 7 n^3 + 3 n^7) \right] - n^7 = 0 | ||
\end{equation*} | ||
\end{examp} | ||
Multiplying by $30$ both, right hand side and left hand side, we get | ||
\begin{equation*} | ||
30 \coeffA{2}{0} n + 5 \coeffA{2}{1} (-n + n^3) + \coeffA{2}{2} (-n + n^5) - 30n^5 = 0 | ||
\end{equation*} | ||
Opening brackets and rearranging the terms gives | ||
\begin{equation*} | ||
30 \coeffA{2}{0} - 5 \coeffA{2}{1} n + 5 \coeffA{2}{1} n^3 - \coeffA{2}{2} n + \coeffA{2}{2} n^5 - 30n^5 = 0 | ||
\end{equation*} | ||
Combining the terms yields | ||
\begin{equation*} | ||
n (30 \coeffA{2}{0} - 5 \coeffA{2}{1} - \coeffA{2}{2}) + 5 \coeffA{2}{1} n^3 + n^5 (\coeffA{2}{2} - 30) = 0 | ||
\end{equation*} | ||
Therefore, the system of linear equations follows | ||
\begin{equation*} | ||
\begin{cases} | ||
30 \coeffA{2}{0} - 5 \coeffA{2}{1} - \coeffA{2}{2} = 0 \\ | ||
\coeffA{2}{1} = 0 \\ | ||
\coeffA{2}{2} - 30 = 0 | ||
\end{cases} | ||
\end{equation*} | ||
Solving it we get | ||
\begin{equation*} | ||
\begin{cases} | ||
\coeffA{2}{2} = 30 \\ | ||
\coeffA{2}{1} = 0 \\ | ||
\coeffA{2}{0} = 1 | ||
\end{cases} | ||
\end{equation*} |