Knot at Lunch on January 30 2008

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Dear Knot at Lunch People,

We will have our next lunch on Wednesday January 30, at the usual place, Bahen 6180, at 12 noon.

As always, please bring brown-bag lunch and fresh ideas. The agenda: we may talk a bit about Artin's theorem on the braid group and automorphisms of the free group, or we may talk about something else.

Further information about this meeting will/may appear at

As always, if you know anyone I should add to this mailing list or if you wish to be removed from this mailing list please let me know. To prevent junk accumulation in mailboxes, I will actively remove inactive people unless they request otherwise.



Another Invitation

Madre, at Aluna Theatre, January 29 - February 17, featuring Hernando's daughter Juliette Burgos.

Possible Agenda

  • The Artin representation of the pure braid group on n strand PB_n into the automorphism group \operatorname{Aut}(F_n) of the free group on n generators F_n (hey, I'm not even sure that's what it's called!).
    • Abstract definition.
    • Practical computation from the Wirtinger presentation.
    • Practical computation by stirring the soup.
    • Properties.
    • Artin's theorem (is that what it's called?).
    • Is there an Artin's theorem for pure virtual braids?
    • What is the finite type completion of \operatorname{Aut}(F_n)? How about some of its obvious subgroups?