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Glossary of field theory : ウィキペディア英語版
Glossary of field theory

Field theory is the branch of mathematics in which fields are studied. This is a glossary of some terms of the subject. (See field theory (physics) for the unrelated field theories in physics.)
==Definition of a field==
A field is a commutative ring (''F'',+,
*) in which 0≠1 and every nonzero element has a multiplicative inverse. In a field we thus can perform the operations addition, subtraction, multiplication, and division.
The non-zero elements of a field ''F'' form an abelian group under multiplication; this group is typically denoted by ''F''×;
The ring of polynomials in the variable ''x'' with coefficients in ''F'' is denoted by ''F''().

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