In mathematics, specifically in symplectic geometry and algebraic geometry, Gromov–Witten (GW) invariants are rational numbers that, in certain situations, count the number of curves (pseudoholomorphic or algebraic) meeting prescribed conditions in a given ambient space (a symplectic manifold or a smooth projective variety). The GW invariants may be packaged as a homology or cohomology class in an appropriate space, or as the deformed cup product of quantum cohomology.
In mathematics, specifically in symplectic geometry and algebraic geometry, Gromov–Witten (GW) invariants are rational numbers that, in certain situations, count the number of curves (pseudoholomorphic or algebraic) meeting prescribed conditions in a given ambient space (a symplectic manifold or a smooth projective variety). The GW invariants may be packaged as a homology or cohomology class in an appropriate space, or as the deformed cup product of quantum cohomology.
Source: Wikipedia "Gromov–Witten invariant" · CC BY-SA 4.0
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