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  2. Maximal ideal - Wikipedia

    en.wikipedia.org/wiki/Maximal_ideal

    If R is a unital commutative ring with an ideal m, then k = R/m is a field if and only if m is a maximal ideal. In that case, R/m is known as the residue field. This fact can fail in non-unital rings. For example, is a maximal ideal in , but / is not a field. If L is a maximal left ideal, then R/L is a simple left R-module.

  3. Ideal (ring theory) - Wikipedia

    en.wikipedia.org/wiki/Ideal_(ring_theory)

    Maximal ideal: A proper ideal I is called a maximal ideal if there exists no other proper ideal J with I a proper subset of J. The factor ring of a maximal ideal is a simple ring in general and is a field for commutative rings. [12] Minimal ideal: A nonzero ideal is called minimal if it contains no other nonzero ideal.

  4. Symbolic power of an ideal - Wikipedia

    en.wikipedia.org/wiki/Symbolic_power_of_an_ideal

    In algebra and algebraic geometry, given a commutative Noetherian ring and an ideal in it, the n-th symbolic power of is the ideal = ⁡ (/) ()where is the localization of at , we set : is the canonical map from a ring to its localization, and the intersection runs through all of the associated primes of /.

  5. Ideal (order theory) - Wikipedia

    en.wikipedia.org/wiki/Ideal_(order_theory)

    Assume the ideal M is maximal with respect to disjointness from the filter F. Suppose for a contradiction that M is not prime, i.e. there exists a pair of elements a and b such that a ∧ b in M but neither a nor b are in M. Consider the case that for all m in M, m ∨ a is not in F.

  6. System of parameters - Wikipedia

    en.wikipedia.org/wiki/System_of_parameters

    m is a minimal prime over (x 1, ..., x d). The radical of (x 1, ..., x d) is m. Some power of m is contained in (x 1, ..., x d). (x 1, ..., x d) is m-primary. Every local Noetherian ring admits a system of parameters. [1] It is not possible for fewer than d elements to generate an ideal whose radical is m because then the dimension of R would ...

  7. Completion of a ring - Wikipedia

    en.wikipedia.org/wiki/Completion_of_a_ring

    The completion of a Noetherian local ring with respect to the unique maximal ideal is a Noetherian local ring. [ 3 ] The completion is a functorial operation: a continuous map f : R → S of topological rings gives rise to a map of their completions, f ^ : R ^ → S ^ . {\displaystyle {\widehat {f}}:{\widehat {R}}\to {\widehat {S}}.}

  8. Nakayama's lemma - Wikipedia

    en.wikipedia.org/wiki/Nakayama's_lemma

    Let M be an R-module generated by n elements, and φ: MM an R-linear map. If there is an ideal I of R such that φ(M) ⊂ IM, then there is a monic polynomial = + + + with p k ∈ I k, such that = as an endomorphism of M.

  9. Boolean prime ideal theorem - Wikipedia

    en.wikipedia.org/wiki/Boolean_prime_ideal_theorem

    For any ideal I of a Boolean algebra B, the following are equivalent: I is a prime ideal. I is a maximal ideal, i.e. for any proper ideal J, if I is contained in J then I = J. For every element a of B, I contains exactly one of {a, ¬a}. This theorem is a well-known fact for Boolean algebras.

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