Let $C$ constant matrix and $\Phi$ a fundamental matrix, i need to show that $C\Phi$ is not necesary a solution for the equation $y'=Ay$. I think the solution follows from seeing that the determinant of C can be 0 and that give a problem, but i dont see, any hint? thanks!
2026-03-25 10:57:05.1774436225
The product of a fundamental matrix and constant matrix is not a solution.
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