(mathematics) Preserving a specified property under transformation.

(algebra, representation theory) The branch of algebra concerned with actions of groups on algebraic varieties from the point of view of their effect on functions.

plural of semi-invariant

(mathematics) Synonym of cumulant

(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.