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[Analysis] Fix Taylor Formulas
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\remark Taylor polynomials of degree $1,2$:
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\remark Taylor polynomials of degree $1,2$:
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\begin{align*}
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\begin{align*}
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& T_1f(y;x_0) = f(x_0) + \nabla f(x_0)\cdot y \\
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& T_1f(y;x_0) = f(x_0) + \nabla f(x_0)\cdot y \\
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& T_2f(y;x_0) = f(x_0) + \nabla f(x_0) \cdot y + \frac{1}{2} \Bigl( x_0^\top \cdot \textbf{H}_f(y) \cdot x_0\Bigr)
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& T_2f(y;x_0) = f(x_0) + \nabla f(x_0) \cdot y + \frac{1}{2} \Bigl( y^\top \cdot \textbf{H}_f(x_0) \cdot y\Bigr)
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\end{align*}
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\end{align*}
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\method Calculating $T_kf(y;x_0)$ also yields $\textbf{H}_f$ for $k \geq 2$.
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\method Calculating $T_kf(y;x_0)$ also yields $\textbf{H}_f$ for $k \geq 2$.
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