Integral domain
Definition
An integral domain is a commutative ring with these two properties.
- in .
- For all , if , then or .
Equivalently, is a nonzero commutative ring in which is the only zero divisor.
Remarks
The integers and every field are integral domains. The ring is not an integral domain, because . In an integral domain, cancellation holds for nonzero factors. Some authors, and Mathlib, also use the word domain for a noncommutative ring with property 2.
Explanations
L1 human
An integral domain is a ring that behaves like the integers for products. If a product is zero, then one of the factors is zero. This is what you use when you solve .
What this node needs for W2
- edge instance_of in: one example (0 of 1)
- edge not_instance_of in: one non-example that fails one clause (0 of 1)
The writing levels say how complete the text of a node is. They do not measure its truth.
What this needs
To read this node, read these 5 nodes in this order. The foundations come first, and the list ends with this node.
- no evidence level
- Group concept
- Ring definition
- Commutative ring definition
- Zero divisor definition
- Integral domain definition
What depends on this
71 nodes use this node, directly or through other nodes.
- The integers are a Euclidean domain 000JFQGDXG
- The characteristic of an integral domain is zero or prime 00758QM6JJ
- Irreducible polynomial 00X2A9G9W3
- Uniqueness of finite fields of a given order 010PKCQPXP
- Existence of splitting fields 01441KDGBY
- Uniqueness of the algebraic closure 01VQ7C4FTB
- Euclidean algorithm in a Euclidean domain 023VY493K0
- Eisenstein's criterion 02BPKD7TMD
- Algebraically closed field 02SJG1HC32
- Norm on the Gaussian integers 03AN1V4ZFJ
- Galois field 04SGPNT8R9
- Irreducible element 052SDEPZH7
- PID implies UFD 055HT85T3S
- The rationals as the field of fractions of the integers 05K3J8J8T2
- Maximal ideals are prime 05WAF5T0GZ
- Uniqueness of splitting fields 069A3BC3EP
- Z[x] is not a principal ideal domain 06E3AG9TM2
- Units of the Gaussian integers 06RH4XAGRY
- Unique factorisation domain 06YMXJMXYS
- Product of primitive polynomials is primitive 08C1NWBNHA
- Content of a polynomial 08VV7YJRB7
- In a PID a nonzero element is irreducible iff it generates a maximal ideal 095ZHQ7WCJ
- R/P is an integral domain iff P is prime 0AVXBEC05W
- K[x]/(f) is a field iff f is irreducible 0AWMPX35CW
- R[x] is an integral domain iff R is 0B5Z1EC66J
- Order of the Galois group of a Galois extension equals its degree 0BDJBH8B4Z
- Z[√-5] is not a UFD 0BSJYCG7NM
- Normal extension 0CBRFQ7DVZ
- A finite field of order q is the splitting field of x^q - x 0CDAHW576M
- Irreducible elements need not be prime 0CHE3J7QMX
- Finite subgroups of the multiplicative group of a field are cyclic 0CKGBEJX6B
- Impossibility of doubling the cube 0CQ357M0QS
- Polynomial ring over a UFD is a UFD 0D6KH8Y59N
- K[x] is a Euclidean domain 0DQG39K2NH
- Galois extension 0DS2F7GK05
- A finite integral domain is a field 0EBE031B8E
- The multiplicative group of a finite field is cyclic 0EBZ3G455G
- Existence of an algebraic closure 0ETGBAK2CC
- Impossibility of trisecting the angle 0EWXPZCSZ0
- Prime elements are irreducible in an integral domain 0F0K8DB9TD
- Greatest common divisor in an integral domain 0F7KNJ1ZYN
- Euclidean domain 0GJ2HRG95T
- Cancellation in an integral domain 0GJM24EXP9
- The order of a finite field is a prime power 0H5WWC8RZX
- Gaussian integers 0K5W69AC0J
- A polynomial over a field has at most as many roots as its degree 0KJVQV3E0F
- Reduction modulo p test for irreducibility 0KWWEXW0RN
- Adjoining a root of a polynomial 0M893X7YY7
- Algebraic closure 0MCXX29HWY
- Degree of a simple extension is the degree of the minimal polynomial 0N5QW9K7MH
- The minimal polynomial is irreducible 0NFEG48RDR
- Z/pZ is a field for p prime 0NV6E43P4A
- The Gaussian integers are a Euclidean domain 0PN13BB7BT
- Gauss's lemma 0QFV5Y1Z5X
- Euclidean domains are principal ideal domains 0QKVE1GD9A
- In a UFD irreducible elements are prime 0QRCFZKXH8
- Principal ideal domain 0RZYDVZ475
- Irreducibility of the cyclotomic polynomials over the rationals 0SK1VHZ5R2
- Primitive polynomial 0SP14DZN0G
- The degree of a constructible number is a power of two 0SSSM1D475
- Fundamental theorem of Galois theory 0T1Q8D0FW8
- Degree of a product 0T233AZ1GE
- Existence of finite fields of every prime power order 0T8M3YC5RG
- Field of fractions 0VF11ZTTMD
- Every polynomial has a root in some extension field 0VG02M1FEZ
- Polynomials of degree two or three are irreducible iff they have no roots 0VNE161QCK
- Bézout's identity in a Euclidean domain 0VY3WPP9Y3
- Impossibility of squaring the circle 0X7CVDE3BG
- Gauss–Wantzel theorem 0Y34JMJNE9
- Primitive element of a finite field 0YAA9CJQXF
- K(a) is isomorphic to K[x] modulo the minimal polynomial 0ZN39QDTP9
Sources
What links here
Used by
- The characteristic of an integral domain is zero or prime 00758QM6JJ
- Irreducible element 052SDEPZH7
- Unique factorisation domain 06YMXJMXYS
- R/P is an integral domain iff P is prime 0AVXBEC05W
- R[x] is an integral domain iff R is 0B5Z1EC66J
- A finite integral domain is a field 0EBE031B8E
- Prime elements are irreducible in an integral domain 0F0K8DB9TD
- Greatest common divisor in an integral domain 0F7KNJ1ZYN
- Euclidean domain 0GJ2HRG95T
- Cancellation in an integral domain 0GJM24EXP9
- Gaussian integers 0K5W69AC0J
- Principal ideal domain 0RZYDVZ475
- Degree of a product 0T233AZ1GE
- Field of fractions 0VF11ZTTMD