plural of semi-invariant

(mathematics) Synonym of cumulant

(astronomy) The orbital plane passing through a planetary system's barycenter (center of mass) perpendicular to its angular momentum vector.

plural of invariable plane

(geometry) A certain invariant of complex projective surfaces.

plural of Zeuthen-Segre invariant

plural of Gromov-Witten invariant

(mathematics) A rational number that, in certain situations, counts pseudoholomorphic curves meeting prescribed conditions in a given symplectic manifold. They have applications in string theory.

plural of Donaldson-Thomas invariant

(algebraic geometry) Given a compact moduli space of sheaves on a Calabi-Yau threefold, its Donaldson-Thomas invariant is the virtual number of its points, i.e., the integral of the cohomology class 1 against the virtual fundamental class.