Coefficients of characteristic polynomials.

For matrices of size N, the coefficients of the characteristic polynomials are indicated as a function of the values of the matrix. For each size, the results are shown for the cases of biological and artificial feedforward connections. We denote κ1 = α11 + α22 + α33, κ2 = α12α21 + α23α32, κ3 = α12α23α31, κ4 = α11α22 + α11α33 + α22α33, κ5 = α11α23α32 + α33α12α21, κ6 = α11α22α33.