Nonsymmetric biquadratic tensors are positive semidefinite exactly when all their M-eigenvalues are nonnegative, with new eigenvalue bounds and an optimization-based solver.
Standard bi-quadratic optimization problems and unconstrained polynomial reformulations
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Biquadratic Tensors: Eigenvalues and Structured Tensors
Nonsymmetric biquadratic tensors are positive semidefinite exactly when all their M-eigenvalues are nonnegative, with new eigenvalue bounds and an optimization-based solver.