# Contents

## Idea

A modular operad is an operad that has the kind of extra structure which is exhibited by the operad whose $n$-ary operations are Riemann surfaces with $(n+1)$-punctures, and whose composition is sewing of such surfaces. Every modular operad has a structure of a cyclic operad and also some additional structure.

## Motivations

• 2d TQFT
• constructing graph complexes of Kontsevich as Feynman transforms of suitable twisted modular operad?s

## References

Revised on December 17, 2010 14:37:56 by Urs Schreiber (131.211.232.207)