Atiyah–Bott formula

In algebraic geometry, the Atiyah–Bott formula says the cohomology ring
 * $$\operatorname{H}^*(\operatorname{Bun}_G(X), \mathbb{Q}_l)$$

of the moduli stack of principal bundles is a free graded-commutative algebra on certain homogeneous generators. The original work of Michael Atiyah and Raoul Bott concerned the integral cohomology ring of $$\operatorname{Bun}_G(X)$$.