Ruffini-Horner Algorithm for Complex Arguments
Suppose we need to calculate a value of the polynomial with real coefficients for the complex argument . We divide the polynomial by , where and . The remainder is then a linear function and the value of the polynomial is the value of the remainder. In the table, that is the value at the bottom right.[more]
The table is defined as follows, where the last row is the sum of the higher rows:
According to [1, p. 1034] this is called the Collatz contribution.
 D. Kurepa, Higher Algebra, Book 2 (in Croatian), Zagreb: Skolska knjiga, 1965.