**6.22 Wronski’s determinant**

If the *N* functions *y*_{1}(*x*), . . . , *y _{N}*(

(6.202) |

vanishes for all *x*. Differentiating *i* times, we get

(6.203) |

for all *x*. So if we use the *y _{j}* and their derivatives to define the matrix

(6.204) |

then we may express the linear dependence (6.202) and (6.203) of the functions *y*_{1}, . ...

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