Common invariant subspaces of two matrices

@article{George1999CommonIS,
  title={Common invariant subspaces of two matrices},
  author={A. George and K. Ikramov},
  journal={Linear Algebra and its Applications},
  year={1999},
  volume={287},
  pages={171-179}
}
Abstract A finite rational procedure of the Shemesh type is proposed to check whether given complex n × n matrices A and B have a common invariant subspace of dimension k , 2 ≤ k n . The only restriction is that at least one of A and B must have distinct eigenvalues. This fact can also be verified by a finite rational computation. 
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