# Contents

## Idea

A 4d TQFT obtained by a “topological twist” from 4d super Yang-Mills theory. Its S-duality is supposed to encode, as a special case geometric Langlands duality.

Upon compactification down to 2d it reproduces, at certain parameters, the A-model and the B-model.

## References

The TQFT was introduced in

Reviews include

The 0-1-2 extended QFT version of $\mathrm{GL}$-twisted N=4 D=4 super Yang-Mills theory is considered in

A discussion formalized in terms of derived geometry is in

• Kevin Costello, Notes on supersymmetric and holomorphic field theories in dimension 2 and 4 (pdf)
Revised on October 23, 2011 13:31:03 by Urs Schreiber (82.113.121.56)