duality

## In QFT and String theory

#### 2-Category theory

2-category theory

## Idea

A dual adjunction between categories $C$ and $D$ is an adjunction between the opposite category $C^{op}$ of $C$ and $D$.

The concept arises in the context of duality.

Dual adjunctions between concrete categories may be represented by dualizing objects.

Dual adjunctions between posets are also called Galois connections.

Revised on February 27, 2014 08:24:29 by Urs Schreiber (82.113.98.143)