La géométrie symplectique est un domaine actif de la recherche mathématique, né de la volonté d'une formulation mathématique naturelle à la mécanique classique. Elle est à la rencontre de la géométrie différentielle et des systèmes dynamiques. En mathématiques, elle trouve des applications en géométrie algébrique, en géométrie riemannienne et en géométrie de contact.

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  • La géométrie symplectique est un domaine actif de la recherche mathématique, né de la volonté d'une formulation mathématique naturelle à la mécanique classique. Elle est à la rencontre de la géométrie différentielle et des systèmes dynamiques. En mathématiques, elle trouve des applications en géométrie algébrique, en géométrie riemannienne et en géométrie de contact. Formellement, elle est définie comme l'étude des 2-formes différentielles fermées non dégénérées — appelées formes symplectiques — sur les variétés différentielles.
  • Symplectische meetkunde is een deelgebied van de wiskunde dat geïnspireerd is door ideeën uit de analytische mechanica.
  • La geometria simplettica è la branca della geometria differenziale e della topologia differenziale che studia le varietà simplettiche, cioè varietà differenziabili equipaggiate con una 2-forma chiusa non degenere.La geometria simplettica ha le sue origini nella meccanica hamiltoniana, in cui lo spazio delle fasi di certi sistemi prende la struttura di varietà simplettica.Il termine "simplettica" è stato coniato da Hermann Weyl, traducendolo dal greco συμπλεκτικός, come calco di "complessa", con cui il termine condivide lo stesso suffisso indo-europeo -plek. Il nome è stato scelto anche per sottolineare le profonde connessioni tra strutture simplettiche e strutture complesse.
  • Symplectic geometry is a branch of differential geometry and differential topology that studies symplectic manifolds; that is, differentiable manifolds equipped with a closed, nondegenerate 2-form. Symplectic geometry has its origins in the Hamiltonian formulation of classical mechanics where the phase space of certain classical systems takes on the structure of a symplectic manifold.Symplectic geometry has a number of similarities and differences with Riemannian geometry, which is the study of differentiable manifolds equipped with nondegenerate, symmetric 2-tensors (called metric tensors). Unlike in the Riemannian case, symplectic manifolds have no local invariants such as curvature. This is a consequence of Darboux's theorem which states that a neighborhood of any point of a 2n-dimensional symplectic manifold is isomorphic to the standard symplectic structure on an open set of R2n. Another difference with Riemannian geometry is that not every differentiable manifold need admit a symplectic form; there are certain topological restrictions. For example, every symplectic manifold is even-dimensional and orientable. Additionally, if M is a closed symplectic manifold, then the 2nd de Rham cohomology group H2(M) is nontrivial; this implies, for example, that the only n-sphere that admits a symplectic form is the 2-sphere.Every Kähler manifold is also a symplectic manifold. Well into the 1970s, symplectic experts were unsure whether any compact non-Kähler symplectic manifolds existed, but since then many examples have been constructed (the first was due to William Thurston); in particular, Robert Gompf has shown that every finitely presented group occurs as the fundamental group of some symplectic 4-manifold, in marked contrast with the Kähler case.Most symplectic manifolds, one can say, are not Kähler; and so do not have an integrable complex structure compatible with the symplectic form. Mikhail Gromov, however, made the important observation that symplectic manifolds do admit an abundance of compatible almost complex structures, so that they satisfy all the axioms for a Kähler manifold except the requirement that the transition maps be holomorphic.Gromov used the existence of almost complex structures on symplectic manifolds to develop a theory of pseudoholomorphic curves, which has led to a number of advancements in symplectic topology, including a class of symplectic invariants now known as Gromov–Witten invariants. These invariants also play a key role in string theory.
  • シンプレクティック幾何学(シンプレクティックきかがく、英: symplectic geometry)とは、シンプレクティック多様体上で展開される幾何学をいう。シンプレクティック幾何学は解析力学を起源とするが、現在では大域解析学の一分野でもあり、可積分系・非可換幾何学・代数幾何学などとも深い繋がりを持つ。また、弦理論や超対称性との関わりも盛んに研究がなされている。
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  • La géométrie symplectique est un domaine actif de la recherche mathématique, né de la volonté d'une formulation mathématique naturelle à la mécanique classique. Elle est à la rencontre de la géométrie différentielle et des systèmes dynamiques. En mathématiques, elle trouve des applications en géométrie algébrique, en géométrie riemannienne et en géométrie de contact.
  • Symplectische meetkunde is een deelgebied van de wiskunde dat geïnspireerd is door ideeën uit de analytische mechanica.
  • シンプレクティック幾何学(シンプレクティックきかがく、英: symplectic geometry)とは、シンプレクティック多様体上で展開される幾何学をいう。シンプレクティック幾何学は解析力学を起源とするが、現在では大域解析学の一分野でもあり、可積分系・非可換幾何学・代数幾何学などとも深い繋がりを持つ。また、弦理論や超対称性との関わりも盛んに研究がなされている。
  • La geometria simplettica è la branca della geometria differenziale e della topologia differenziale che studia le varietà simplettiche, cioè varietà differenziabili equipaggiate con una 2-forma chiusa non degenere.La geometria simplettica ha le sue origini nella meccanica hamiltoniana, in cui lo spazio delle fasi di certi sistemi prende la struttura di varietà simplettica.Il termine "simplettica" è stato coniato da Hermann Weyl, traducendolo dal greco συμπλεκτικός, come calco di "complessa", con cui il termine condivide lo stesso suffisso indo-europeo -plek.
  • Symplectic geometry is a branch of differential geometry and differential topology that studies symplectic manifolds; that is, differentiable manifolds equipped with a closed, nondegenerate 2-form.
rdfs:label
  • Géométrie symplectique
  • Geometria simplettica
  • Symplectic geometry
  • Symplectische meetkunde
  • Симплектическая геометрия
  • シンプレクティック幾何学
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