An Entity of Type: Thing, from Named Graph: http://dbpedia.org, within Data Space: dbpedia.org

In algebra, Zariski's lemma, proved by Oscar Zariski, states that, if a field K is finitely generated as an associative algebra over another field k, then K is a finite field extension of k (that is, it is also finitely generated as a vector space). ; that is to say, is a zero of .) The lemma may also be understood from the following perspective. In general, a ring R is a Jacobson ring if and only if every finitely generated R-algebra that is a field is finite over R. Thus, the lemma follows from the fact that a field is a Jacobson ring.

Property Value
dbo:abstract
  • In algebra, Zariski's lemma, proved by Oscar Zariski, states that, if a field K is finitely generated as an associative algebra over another field k, then K is a finite field extension of k (that is, it is also finitely generated as a vector space). An important application of the lemma is a proof of the weak form of Hilbert's nullstellensatz: if I is a proper ideal of (k algebraically closed field), then I has a zero; i.e., there is a point x in such that for all f in I. (Proof: replacing I by a maximal ideal , we can assume is maximal. Let and be the natural surjection. By the lemma is a finite extension. Since k is algebraically closed that extension must be k. Then for any , ; that is to say, is a zero of .) The lemma may also be understood from the following perspective. In general, a ring R is a Jacobson ring if and only if every finitely generated R-algebra that is a field is finite over R. Thus, the lemma follows from the fact that a field is a Jacobson ring. (en)
  • Лема Зариського — важлива лема в комутативній алгебрі, яка зокрема використовується при доведенні теореми Гільберта про нулі. Названа на честь Оскара Зарицького. Лема стверджує, що якщо поле L є розширенням поля K і водночас L є скінченно породженою алгеброю над полем K то звідси випливає, що L є скінченним розширенням поля K. (uk)
dbo:wikiPageExternalLink
dbo:wikiPageID
  • 37279342 (xsd:integer)
dbo:wikiPageLength
  • 7237 (xsd:nonNegativeInteger)
dbo:wikiPageRevisionID
  • 1111088653 (xsd:integer)
dbo:wikiPageWikiLink
dbp:authorlink
  • Oscar Zariski (en)
dbp:first
  • Oscar (en)
dbp:last
  • Zariski (en)
dbp:wikiPageUsesTemplate
dbp:year
  • 1947 (xsd:integer)
dcterms:subject
rdfs:comment
  • Лема Зариського — важлива лема в комутативній алгебрі, яка зокрема використовується при доведенні теореми Гільберта про нулі. Названа на честь Оскара Зарицького. Лема стверджує, що якщо поле L є розширенням поля K і водночас L є скінченно породженою алгеброю над полем K то звідси випливає, що L є скінченним розширенням поля K. (uk)
  • In algebra, Zariski's lemma, proved by Oscar Zariski, states that, if a field K is finitely generated as an associative algebra over another field k, then K is a finite field extension of k (that is, it is also finitely generated as a vector space). ; that is to say, is a zero of .) The lemma may also be understood from the following perspective. In general, a ring R is a Jacobson ring if and only if every finitely generated R-algebra that is a field is finite over R. Thus, the lemma follows from the fact that a field is a Jacobson ring. (en)
rdfs:label
  • Lemme de Zariski (fr)
  • Zariski's lemma (en)
  • Лема Зариського (uk)
owl:sameAs
prov:wasDerivedFrom
foaf:isPrimaryTopicOf
is dbo:wikiPageWikiLink of
is foaf:primaryTopic of
Powered by OpenLink Virtuoso    This material is Open Knowledge     W3C Semantic Web Technology     This material is Open Knowledge    Valid XHTML + RDFa
This content was extracted from Wikipedia and is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported License