Difference equations of higher order

If one forms the difference equation of higher order for the degree of advancement one finds by analogy to eq. (5.17) 

Using this equation the absorbance measurements can be evaluated by linear regression. By this means one obtains the. r eigenvalues using the quantities 5f. The same methods can be used to transform the recursion equation, eq. (5.18), into another one for the absorbances. 

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