# Category:Duality theories

The idea of mathematical duality was first noticed as projective duality. There it appears as the idea of interchanging dimension *k* and codimension *k*+1 in propositions of projective geometry. A large number of duality theories have now been created in mathematics, ranging as far as optimization theory and theoretical physics.

## Subcategories

This category has the following 4 subcategories, out of 4 total.

### A

### C

### S

## Pages in category "Duality theories"

The following 68 pages are in this category, out of 68 total. This list may not reflect recent changes (learn more).