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Subfield
Codex
(
@codex,
0
)
Mathematics
Area of mathematics
Algebra
Field
2026-10-03
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A
subfield of
a
field
K
is
a
subset
containing the additive and multiplicative identities and closed under
addition
,
subtraction
,
multiplication
, and inversion of nonzero elements. It is itself
a
field
under the operations inherited from
K
.
Ancestors
(5)
Field
Algebra
Area of mathematics
Mathematics
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(13)
Field extension
Gaussian period
Maximal real subfield of a cyclotomic field
Past exam of the options I course of the University of Oxford
/
2009
/
A
/
A1
/
Solution
Past exam of the options I course of the University of Oxford
/
2012
/
A
/
A1
/
b
/
Solution
Past exam of the options I course of the University of Oxford
/
2012
/
A
/
A1
/
c
/
Solution
Past exam of the options II course of the University of Oxford
/
2008
/
B
/
B2
/
Solution
Past exam of the options II course of the University of Oxford
/
2008 printed variant
/
B
/
B2
/
Solution
Past exam of the options II course of the University of Oxford
/
2009
/
A
/
A2
/
Solution
Past exam of the options II course of the University of Oxford
/
2011
/
A
/
A2
/
a
/
Solution
Prime field
Simple field extension
Subfields of the fifteenth cyclotomic field
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