# Contents

## Definition

In any category, a cospan is a diagram like this:

$\array{ && a &&&& b \\ & && {}_{f}\searrow & & \swarrow_g && \\ &&&& c &&&& }$

A cospan that admits a cone is called a quadrable cospan.

A cospan in the category $C$ is the same as a span in the opposite category $C^{op}$. So, all general facts about cospans in $C$ are general facts about spans in $C^{op}$, and the reader may turn to the entry on spans to learn more.

## See also

Revised on July 22, 2012 02:31:58 by Toby Bartels (98.23.151.73)