[Alta-Logic] Peripatetic seminar this afternoon at 2:00 in ICT616

[Robin Cockett]

Apologies for the late announcement.
-robin

Today's seminar is:

        Time: 2:00pm  8th March (today)
        Place: ICT 616
        Title : Numerical Invariants in Homotopical Algebra
        Speaker: Kalathoor Varadarajan


         Abstract:
                 The Lusternik-Schnirelmann Category of a non empty
         topological space X is (n - 1) where n is the smallest
         number of open sets covering  X with the property that
         each of them is contractible in X . Thus for a contractible space
         the category is 0. If there is no such integer the category
         of X is defined to be infinity. It turned out to be an
         invariant of the homotopy type of X. Tudor Ganea introduced
         a dual invariant "Cocategory" and other invariants Nil X,
         Co-nil X, inductive Category etc and studied their
         inter-relationship.
                We will develop all these concepts for any object
         in a model category in the sense of Quillen.