Definition:Wronskian/General Definition

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Definition

Let $\map {f_1} x, \map {f_2} x, \dotsc, \map {f_n} x$ be real functions defined on a closed interval $\closedint a b$.

Let $f_1, f_2, \ldots, f_n$ be $n - 1$ times differentiable on $\closedint a b$.


The Wronskian of $f_1, f_2, \ldots, f_n$ on $\closedint a b$ is defined as:

$\map W {f_1, f_2, \dotsc, f_n} = \begin {vmatrix} \map {f_1} x & \map {f_2} x & \cdots & \map {f_n} x \\ \map { {f_1}'} x & \map { {f_2}'} x & \cdots & \map { {f_n}'} x \\ \vdots & \vdots & \ddots & \vdots \\ \map { {f_1}^{\paren {n - 1} } } x & \map { {f_2}^{\paren {n - 1} } } x & \cdots & \map { {f_n}^{\paren {n - 1} } } x \\ \end{vmatrix}$

where:

$\begin{vmatrix} \cdots \end{vmatrix}$ denotes the determinant
$\map { {f_1}^{\paren {n - 1} } } x$ denotes the $n - 1$th derivative of $f_1$.


Source of Name

This entry was named for Józef Maria Hoene-Wroński.