TETRAHEDRAL GEOMETRY/TOPOLOGY SEMINAR

  FIRST ANNOUNCEMENT

DATE:               Friday, February 3, 2006               

LOCATION:     Hempfield High School, Room 213 (directions attached)                

                           followed by dinner at a place to be determined.

4:45 TALK:       Ron Umble, Millersville University

                           "Operads with a Twist of Matrons"

                           ABSTRACT: In this talk, we’ll review the associative and A_\infty operads

                           \mathcal{Ass} and \mathcal{A}_\infty and show how they can be used to define an

                           associative algebra and A_\infty algebra structure on a module H.  We’ll observe

                           that Stasheff’s associahedra realize \mathcal{A}_\infty.  I’ll conclude the talk with

                           a hint of the more general objects \mathcal{H} and \mathcal{H}_\infty, called

                           matrons, which can be used to define bialgebra and A_\infty bialgebra structures on H

                           in a completely analogous way.  And I’ll mention that the family of polytopes realizing

                           \mathcal{H_\infty} includes and enlarges the family of associahedra.

     EVERYONE WELCOME

       PLEASE FORWARD THIS ANNOUNCEMENT TO ANYONE INTERESTED

           The Tetrahedral Geometry/Topology Seminar is sponsored jointly by

Elizabethtown College, Franklin & Marshall College, Lebanon Valley College and Millersville University.