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I have to modelize the buckling of a column and I've come up with this system:

[tex] N'(x) + N(x) \theta ' (x) \theta (x) - Q \theta ' (x) + f = 0 [/tex]

[tex] Q'(x) + N(x) \theta ' (x) + Q \theta ' (x) \theta (x) = 0 [/tex]

withfa constant

The coefficients (thetas) are not constants.

I've written it as X' = A X + f But I dont know how to diagonalize A since coefficients are not constants.

Thank You for helping me.

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# Coupled differential equations

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