Nonsymmetric biquadratic tensors are positive semidefinite exactly when all their M-eigenvalues are nonnegative, with new eigenvalue bounds and an optimization-based solver.
New M-eigenvalue intervals and application to the strong ellipticity of fourth-order partially symmetric tensors
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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.