# integral domain

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Wikipedia

### Noun

integral domain (plural integral domains)

1. (algebra, ring theory) Any nonzero commutative ring in which the product of nonzero elements is nonzero. [from 1911] 
A ring $R$ is an integral domain if and only if the polynomial ring $R[x]$ is an integral domain.
For any integral domain there can be derived an associated field of fractions.
• 1990, Barbara H. Partee, Alice ter Meulen, Robert E. Wall, Mathematical Methods in Linguistics, Kluwer Academic Publishers, page 266,
For integral domains, we will use a-1 to designate the multiplicative inverse of a (if it has one; since not all elements need have inverses, this notation can be used only where it can be shown that an inverse exists).
• 2013, Marco Fontana, Evan Houston, Thomas Lucas, Factoring Ideals in Integral Domains, Springer, page 95,
An integral domain is said to have strong pseudo-Dedekind factorization if each proper ideal can be factored as the product of an invertible ideal (possibly equal to the ring) and a finite product of pairwise comaximal prime ideals with at least one prime in the product.
• 2017, Ken Levasseur, Al Doerr, Applied Discrete Structures: Part 2 - Applied Algebra, Lulu.com, page 171,
$[\mathbb {Z} ;+,\cdot ]$ , $[\mathbb {Z} _{p},+_{p},\times _{p}]$ with $p$ a prime, $[\mathbb {Q} ;+,\cdot ]$ , $[\mathbb {R} ;+,\cdot ]$ , and $[\mathbb {C} ;+,\cdot ]$ are all integral domains. The key example of an infinite integral domain is $[\mathbb {Z} ;+,\cdot ]$ . In fact, it is from $\mathbb {Z}$ that the term integral domain is derived. Our main example of a finite integral domain is $[\mathbb {Z} _{p},+_{p},\times _{p}]$ , when $p$ is prime.

#### Usage notes

For a list of several equivalent definitions, see Integral domain#Definition on Wikipedia.Wikipedia

#### Synonyms

• (commutative ring in which the product of nonzero elements is nonzero): entire ring