Oscillation criteria are established for nonlinear matrix differential equations of the form [ A(x)V' ]' + B(x, V, V')V = 0 and associated differential inequalities. The hypothesis used recently by E.
For systems of matrix equations of the form $$U' = A(t, U, V)V,\quad V' = - B(t, U, V)$$ it is shown here that the oscillation problem can be reduced to the ...
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