# Donaldson-Thomas invariant

## English edit

### Etymology edit

Introduced in 1998 by Simon Donaldson and Richard Thomas.

### Noun edit

**Donaldson-Thomas invariant** (*plural* **Donaldson-Thomas invariants**)

- (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.