2006 | OriginalPaper | Buchkapitel
Algebraic Independence
Erschienen in: Field Theory
Verlag: Springer New York
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In this chapter, we discuss the structure of an arbitrary field extension
F
<
E
. We will see that for any extension
F
<
E
. there exists an intermediate field
F
<
F
(
S
) <
E
whose upper step
F
(
S
) <
E
is algebraic and whose lower step
F
<
F
(
S
) is
purely transcendental
, that is, there is no nontrivial polynomial dependency (over
F
) among the elements of
S
, and so these elements act as “independent variables” over
F
. Thus,
F
(
S
) is the field of all rational functions in these variables.