Splitting Fields: Examples
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✓ 8 results · all verified · 2 also independently AI-judged
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1 · Prerequisites
Abstract Algebra
- Binary Operations, Monoids, Groups and Subgroups
- Cosets, Index and Lagrange's Theorem
- Divisibility, Euclidean Domains, Principal Ideal Domains and Unique Factorisation
- Group Homomorphisms and the Isomorphism Theorems
- Ideals, Quotient Rings and the Isomorphism Theorems for Rings
- Normal Subgroups and Quotient Groups
- Polynomial Rings, the Division Algorithm and Roots
- Rings, Subrings, Integral Domains and Fields
- Simple Field Extensions and the Construction of the Complex Numbers
- Splitting Fields
Number Theory
Real Analysis
2 · Logical flowchart
3 · Items
Example
The base field is the splitting field of the empty family and of every nonzero constant polynomial
Example
The splitting field of x²-2 over ℚ is ℚ(√2), with roots ±√2
Example
The splitting field of x³-2 over ℚ is ℚ(³√2,ω) with ω=(-1+i√3)/2
Example
The splitting field of x⁴+2x²-8 over ℚ is ℚ(√2,i)
Example
The splitting field of {x²-2,x²-3} over ℚ is ℚ(√2,√3)
Example
Over F₂, x⁴+x²+1=(x²+x+1)² has two distinct roots, each repeated, in its four-element splitting field
Counterexample
Adjoining one root need not split the polynomial: ℚ(³√2) does not split x³-2
False statement
FALSE: the isomorphism between two splitting fields that fixes the base field is unique
Sources
- T. Judson, Abstract Algebra: Theory and Applications, Section 21.2
- T. Judson, Abstract Algebra: Theory and Applications, Example 21.10
- T. Judson, Abstract Algebra: Theory and Applications, Example 21.15
- J. S. Milne, Fields and Galois Theory, Chapter 2
- T. Judson, Abstract Algebra: Theory and Applications, Corollary 21.14