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Questions related from Igor Ravve
There is a spatial scalar field depending on the three Cartesian coordinates, for example, the Young modulus, E (x) = E (x1, x2, x3), and a reference point. There are two reference frames, local...
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There is a very suitable Jacobi formula for a derivative of the determinant, which works, in particular, for the singular matrices, det' A = trace [A* Inverse (A)], were A* is the adjugate...
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