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based on an earlier version of the Wolfram Language.
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Modulus

Modulus->n
is an option that can be given in certain algebraic functions to specify that integers should be treated modulo n.
  • Equations for Modulus can be given in Solve and related functions.
  • Arithmetic is usually done over the full ring Z of integers; setting the option Modulus specifies that arithmetic should instead be done in the finite ring Z_n.
  • The setting Modulus->0 specifies the full ring Z of integers.
  • Some functions require that Modulus be set to a prime, or a power of a prime. Z_n is a finite field when n is prime.
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