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Explicit Scheme, final stability analysis

The eigenvalues of A are λi=1αμi, with μi being the eigenvalues of ˆB. To find μi we note that the matrix elements of ˆB are bij=2δijδi+1jδi1j, meaning that we have the following set of eigenequations for component i (ˆBˆx)i=μixi, resulting in (ˆBˆx)i=nj=1(2δijδi+1jδi1j)xj=2xixi+1xi1=μixi.