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This chapter discusses networks with multi-position contacts. It presents functions whose domain is finite and whose range is a field. The chapter presents a finite set M with m elements that are denoted by 0, 1,…, m −1. The product of two integers can be congruent with 0 modulo 6 without either of the two factors being congruent with 0 modulo 6. In general, a congruence modulo 6 cannot be simplified by a factor, even if it is not congruent with 0 modulo 6. If the modulus m is not prime, the algebra with congruences modulo m presents essential difficulties. Such difficulties do not arise if the modulus is prime. |