 Further , the proposed method does not fail for the existence of many pairs of extremely close eigenvalues and breaks the previous barrier of problem size . We also discuss the limitation of the scope of problems that the proposed method can solve .
<coherence>  Further , the proposed method does not fail for the existence of many pairs of extremely close eigenvalues and breaks the previous barrier of problem size . We also discuss the limitation of the scope of problems that the proposed method can solve .
 Further , the proposed method does not fail for the existence of many pairs of extremely close eigenvalues and breaks the previous barrier of problem size .