Alphabeta Math

Ideals and Quotient Rings: Examples and Counterexamples

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✓ 6 results · all verified · 0 also independently AI-judged
Every result on this page is machine-checked by a proof checker and read in full and owner-audited; the judge is an additional, independent cross-model AI review of the proofs. The 6 not AI-judged were verified by owner audit (typically over a confirmed judge false positive), not failures.
1 · Prerequisites
2 · Logical flowchart

3 · Items

Example

Null rational sequences form a maximal ideal in the ring of rational Cauchy sequences

Example

The reals are the quotient of rational Cauchy sequences by the maximal ideal of null sequences

Example

For every integer n>1, nℤ is a maximal ideal of ℤ if and only if n is prime

Counterexample

The zero ideal of ℤ is prime but not maximal

Example

2ℤ is an ideal of ℤ but is not a subring under the library's unital convention

Example

R×{0} is the kernel of R× S→ S, so (R× S)/(R×{0})≅ S

Sources