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non-Positive definite stiffness matrix

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soildynamics

Civil/Environmental
Jun 16, 2007
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If the determinant of a matrix is positive , does that mean that the matrix must be positive definite
 
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Absolutely no.
The definition of the possitive definite matrix is the following
For every x (vector) x'Ax>0
which means possitive eigenvalues
no positive determinant


Dr. Costas J. Tsaprounis
 
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