Title: Feynman graphs and compact multicategories

    Abstract: I will describe a category of Feynman graphs and
    show how it relates to compact symmetric multicategories
    (coloured modular operads) just as linear orders relate to
    categories and rooted trees relate to multicategories.  More
    specifically I will explain the following nerve theorem:
    compact symmetric multicategories can be characterised as
    presheaves on the category of Feynman graphs subject to a
    Segal condition.  This is joint work with AndrŽ Joyal.