
Notes on Galois Theory
... F [x]. Suppose that α1 , . . . , αn are the (distinct) roots of f (x) that lie in E, i.e. {α ∈ E : f (α) = 0} = {α1 , . . . , αn } and, for i 6= j, αi 6= αj . Then Gal(E/F ) acts on the set {α1 , . . . , αn }, and hence there is a homomorphism ρ : Gal(E/F ) → Sn , where Sn is the symmetric group on ...
... F [x]. Suppose that α1 , . . . , αn are the (distinct) roots of f (x) that lie in E, i.e. {α ∈ E : f (α) = 0} = {α1 , . . . , αn } and, for i 6= j, αi 6= αj . Then Gal(E/F ) acts on the set {α1 , . . . , αn }, and hence there is a homomorphism ρ : Gal(E/F ) → Sn , where Sn is the symmetric group on ...
Packaging Mathematical Structures - HAL
... Many of the op-cited works focused on the definition of the hierarchy rather than its use, making simplyfying assumptions that would have masked the problems we encountered. For example some assume that only one or two structures are involved at any time, or that all structures are explicitly spcifi ...
... Many of the op-cited works focused on the definition of the hierarchy rather than its use, making simplyfying assumptions that would have masked the problems we encountered. For example some assume that only one or two structures are involved at any time, or that all structures are explicitly spcifi ...