# Primal ideal

In mathematics, an element *a* of a commutative ring *A* is called **(relatively) prime** to an ideal *Q* if whenever *ab* is an element of *Q* then *b* is also an element of *Q*.

A proper ideal *Q* of a commutative ring *A* is said to be **primal** if the elements that are not prime to it form an ideal.

## References

- Fuchs, Ladislas (1950), "On primal ideals",
*Proceedings of the American Mathematical Society*,**1**: 1–6, doi:10.2307/2032421, MR 0032584.

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