Link to memorial for Joe Roitberg

CUNY Graduate Center Topology Seminar

The seminar meets Wednesdays 4:30-5:30 in room 4214.03 at the Graduate Center. The mathematics department lounge is room 4214.

The building is at 365 5th Avenue (34th St) in Manhattan.

Here are links for Parking lots in NY (the neighborhood is called Murray Hill).

For more information about the seminar, or to add a name to the seminar mailing list, contact Martin Bendersky

**Speaker: David Recio Mitter, Lehigh University**

**Title: Topological
robotics and braid groups**

**Abstract:
One of the main problems in robotics is that of motion planning. It
consists of finding an algorithm which takes pairs of positions as an
input and outputs a path between them. It is not always possible to
find such an algorithm which depends continuously on the inputs.
Studying this problem from a topological perspective, in 2003 Michael
Farber introduced the topological complexity of a space, which
measures the minimal (unavoidable) discontinuity of all motion
planners on a given topological space. The topological complexity
TC(X) turns out to be a homotopy invariant of the space X.In
this talk we will determine (or narrow down to a few values in some
cases) the topological complexity of the unordered configuration
spaces of aspherical surfaces (including surfaces with boundary and
non-orientable surfaces). We will also see how this can be understood
as the topological complexity of the surface braid groups.This
is joint work with Andrea Bianchi.**

**Restaurant: 2nd Ave. deli.**

· **Date**
**Wed. Oct 10, 4:30-5:30 **

Speaker: Scott Wilson, Queens
College

**Title:
A spectral sequence for almost complex manifolds****Abstract:
I'll present a spectral sequence for almost complex****manifolds,
converging to deRham cohomology, that generalizes the****Frolicher
(bi-complex) spectral sequence of complex manifolds.
The****differentials
on various pages will be described and I'll explain how****the
E_1 page can be identified with a natural generalization of****Dolbeault
cohomology for almost complex manifolds. As applications,****I'll
describe several explicit calculations for Lie groups
and****nilmanifolds
as a degeneration result for highly non-integrable almost****complex
structures. This is recent joint work with Joana Cirici. A****preprint
is available at arxiv:1809.01416**

**Restaurant: Restaurant: ** **Chennai
Garden**

127
East 28th Street. Between Park and Lexington

· **Date Wed. April
18, 4:30-5:30 Speaker: Alina Vdovina, Hunter College **

**Title: "Low complexity algorithms in knot theory" **

**Abstract: We show that the genus problem for alternating knots
with $n$ crossings, as well as the Seifert genus problem for an
arbitrary knot, has time complexity $n\log (n)$ and is in
Logspace$(n)$ and $TC^{0}$ complexity classes. Almost all alternating
knots of given genus possess additional combinatorial structure, we
call them standard. We show, that the equivalence problem for such
knots with $n$ crossings also has time complexity $n\log (n)$ and is
in Logspace$(n)$ and $TC^{0}$ complexity classes. **

**Restaurant: 162 E 33rd Street, between Lexington and 3rd.
Link to 2nd Ave Deli **

· **Date**
**Wed. April 25, 4:30-5:30 Speaker: Thomas Bartsch, Giessen
University **

**Title: "A Mini-course on Detecting critical points with
Borel cohomology" **

**Abstract: In this lecture I will show how Borel cohomology can
be used to find critical points of functionals where classical
topological tools like Lusternik-Schnirelmann category or the
Krasnoselski genus are not sufficient **

· **Date
Wed. April 18, 4:30-5:30 Speaker: Alina Vdovina, Hunter College **

**Title: "Low complexity algorithms in knot theory" **

**Abstract: We show that the genus problem for alternating knots
with $n$ crossings, as well as the Seifert genus problem for an
arbitrary knot, has time complexity $n\log (n)$ and is in
Logspace$(n)$ and $TC^{0}$ complexity classes. Almost all alternating
knots of given genus possess additional combinatorial structure, we
call them standard. We show, that the equivalence problem for such
knots with $n$ crossings also has time complexity $n\log (n)$ and is
in Logspace$(n)$ and $TC^{0}$ complexity classes. **

**Restaurant: TBA.162 E 33rd Street, between Lexington and
3rd. Link to 2nd Ave Deli **

· **Date
Wed. March 7, 4:30-5:30 Speaker: Steve Scheirer, Lehigh
University **

**Title: "Topological complexity of graph configuration
spaces," **

**Abstract: The topological complexity of a path-connected space
X, denoted by TC(X), is an integer which can be thought of as the
minimum number of "continuous rules" required to describe
how to move between any two points of X. We will consider the case in
which X is a space of configurations of n points on a graph. This
space can be viewed as the space of configurations of n robots which
move along a system of one-dimensional tracks. We will recall Farley
and Sabalka's approach to studying these spaces using discrete Morse
theory and discuss how this can be used to determine the topological
complexity. **

**Restaurant: 2nd Avenue Deli.162 E 33rd Street, between
Lexington and 3rd. Link to
2nd Ave Deli **

· **Date
Wed. February 28 4:30-5:30 Speaker: Robert Short, Lehigh
University **

**Title: Relative Topological Complexity for Pairs of
Right-Angled Artin Groups **

**Abstract: Topological complexity is a homotopy invariant
introduced by Michael Farber in the early 2000s. Denoted TC(X), it
counts the smallest size of a continuous motion planning algorithm on
X. In this sense, it solves optimally the problem of continuous
motion planning in a given topological space. In topological
robotics, a part of applied algebraic topology, several variants of
TC are studied. In a recent paper, I introduced the relative
topological complexity of a pair of spaces (X, Y ) where Y **⊂ **X.
Denoted TC(X, Y ), this counts the smallest size of motion planning
algorithms that plan from X to Y . Right-angled Artin groups have
grown in importance lately with their connection to braid groups and
their connection to real-world robotics problems. In this talk, we
will present the background needed to compute the relative
topological complexity of pairs of right-angled Artin groups and
hopefully discuss the details of the optimal motion planner involved.
**

**Restaurant:Mandoo** **Bar2 W. 32nd Street, between
Broadway and 5th Link
to review **

Schedule, Fall, 2017

· **Date Wed.
December 6 4:30-5:30 Speaker: Joel Zablow **

**Title: Braid relations and deep braiding **

**Abstract: We'll look at deep braiding in groups, i.e.
non-obvious braiding, ABA=BAB, among products of generators, looking
first at deep braiding in symmetric groups among k-cycles in S_n, for
k ≤ n. When n≤5 (and probably in general), there are graphs and
polyhedra, which I call platihedra, which organize braided k-cycles
and exhibit interactions between the algebra of braiding and the
combinatorics of the polyhedra. Connected components of the graphs
(or of platihedra) with braided k-cycle labeled vertices, exhibit
quandle structures. We'll look at a criterion under which deep braids
in S _n can be "lifted" to deep braids in the braid groups
B_n. Time permitting, we'll see an extension of deep braiding to the
mapping class group of a genus 2 surface (hinting at such in
arbitrary genus), applications to forming deep commutation relations
in a host of groups, and/or to analogs of the Zamolodchikov
tetrahedron equation, relating surfaces in 4-space and 2-morphisms in
certain braided monoidal 2-categories. **

**Restaurant:Vatan** **(a vegetarian Indian restaurant) 409
3rd Ave between 28th and 29th. Link to
Vatan. **

· **Date
Wed. Oct. 11, 5:00-6:00 NOTE CHANGE OF TIME Speaker: Don Davis,
Lehigh University **

**Title: n-dimensional Klein bottles**

**Abstract: An n-dimensional version of the Klein bottle arose in
our work in topological robotics. We discuss how it arose, and
various aspects of its algebraic and differential topology. **

**Restaurant:Mandoo** **Bar2 W. 32nd Street, between
Broadway and 5th Link
to review **

· **Date
Wed. Sept. 27, 4:30-5:30 Speaker: Michael Harrison, Lehigh
University **

**Title: The h-principle and totally convex immersions.**

**Abstract: The h-principle is a powerful tool in differential
topology which is used to study spaces of functions with certain
distinguished properties (immersions, submersions, k-mersions,
embeddings, free maps, etc.). I will discuss some examples of the
h-principle and give a neat proof of a special case of the
Smale-Hirsch Theorem, using the "removal of singularities"
h-principle technique due to Eliashberg and Gromov. Finally, I will
define and discuss totally convex immersions and discuss some
h-principle statements in this context. **

**Restaurant: La Vie En Szechuan 14 E 33rd St. Link
to La Vie En Szechuan on Yelp **

· **Date**
**Tuesday, January 31, 4:00 – 5:00 NOTE CHANGE OF DAY AND
TIME.Speaker: John Klein, Wayne State University**

**Title: **Applications
of higher dimensional spanning trees.

**Abstract: **I
will introduce the notion of a spanning tree in a finite CW complex

of arbitrary dimension. We utilize this to give an analogue of Kirchhoff's

electrical and matrix-tree theorems in higher dimensions.

We will also describe a new combinatorial invariant of a CW complex called the

hypercurrent. The latter is motivated by the investigation of stochastic motion of

cellular cycles of a given dimension.

**Restaurant: ** **Chennai
Garden**

127
East 28th Street. Between Park and Lexington

Link
to Chennai Garden

· **Date Wed.
March 9, 5:00-6:00 Speaker: Nick Kuhn, University of Virginia **

**Title: The topological numerical polynomial ring**

**Abstract: Let P be the ring of polynomials over the rationals
that take integer values when evaluated on integers. This ring has
long been known to appear in algebraic topology as the K-homology of
infinite complex projective space. We have found P appearing in a
more basic way as the homology of a nice commutative ring spectrum we
are terming the topological numerical polynomial ring. **

**Restaurant: Restaurant: Kang Suh 1250 Broadway (near 32nd) **

**· Date Wed.
Feb 17, 5:00-6:00 Speaker: Joe Neisendorfer, University of
Rochester **

**Title: THE BEST POSSIBLE BOUND ON THE EXPONENT OF THE HOMOTOPY
GROUPS OF AN ODD PRIMARY MOORE SPACE **

**Abstract: Let p be an odd prime. We shall prove that the
homotopy groups of a mod $p^r$ Moore space are annihilated by
$p^{r+1}$. The method is to apply a surprising general splitting
theorem and then a general "semi-splitting" theorem to the
loop space of a Moore space. Although this is an old result, the
proof has now been much improved and it can now be talked about. **

**Joe is willing to give a pre-talk if there is interest. Title
of Pre-talk: THE EXISTENCE OF HIGHER ORDER TORSION IN THE HOMOTOPY
GROUPS OF AN ODD PRIMARY MOORE SPACEAbstract of Pre-talk: Let p
be an odd prime. We shall prove the existence of infinite families of
torsion of order p^{r+1} in the unstable homotopy groups of mod $p^r$
Moore spaces. The method is to use the Bockstein spectral sequence to
study the representation of the differential graded Lie algebra of
mod $p$ homotopy into the mod $p$ homology of the loop space. **

**Restaurant: La Vie En Szechuan 14 E 33rd St. Link
to La Vie En Szechuan on Yelp **

**· Date Wed.
Dec 9, 5:00-6:00 Speaker: Don Davis, Lehigh University **

**Title: Topological Complexity of Spaces of Polygons.**

**Abstract: The topological complexity of a topological space X
is the number of rules required to specify how to move between any
two points of X. If X is the space of all configurations of a robot,
this can be interpreted as the number of rules required to program
the robot to move from any configuration to any other. A polygon in
the plane or in 3-space can be thought of as linked arms of a robot.
We compute the topological complexity of the space of polygons of
fixed side lengths. Our result is complete for polygons in 3-space,
and partial for polygons in the plane. **

**Carbone Ristorante 331 W. 38th (between 8th and 9th) **

**· Date Wed
November 4, 5:00 - 6:00 Speaker: Don Larson, Penn State, Altoona,
**

**Title: Modular forms and the beta family**

**Abstract: Let p be a prime greater than 3.** **In 2008, M.
Behrens proved the existence of a 1-1 correspondence between beta
elements in the p-primary Adams-Novikov spectral sequence and modular
forms over Z up to certain congruence conditions depending on p. The
proof used homotopical properties of a spectrum denoted Q. In this
talk, I will briefly highlight some previous work on the homotopy of
Q at the prime 3 (where Behrens' correspondence is not known to
exist), and then I will describe work in progress at higher primes
that attempts to make the correspondence explicit. The talk will be
as expository as possible. **

**Restaurant: TBA **

**· Date:
Wed, Sept 30, 5:00-6:00 Speaker: Tony Bahri, Rider University **

**Title: On the integral cohomology rings of toric orbifolds.**

**Abstract: A criterion is described which ensures that a toric
orbifold, determined by a simple polytope and a characteristic map,
has torsion free cohomology concentrated in even degree. The
description is shown to transform well under the simplicial wedge
construction. A report of joint work with Soumen Sarkar and Jongbaek
Song. **

**Restaurant: La Vie En Szechuan 14 E 33rd St. Link
to La Vie En Szechuan on Yelp **

**· Date:
Wed, April 22, 5:30-6:30 Speaker: Doug Ravenel, University of
Rochester**

**Title: Inside the proof of the Kervaire invariant theorem or
How I got bitten by the equivariant bug. **

**DOUG AS AGREED TO GIVE AN INTRODUCTORY TALK BEFORE HIS LECTURE.**
**WE CANNOT GIVE A PRECISE TIME SINCE HE ARRIVES AT JFK AT 1 PM. MY
GUESS IS IT WILL START SOMEWHERE BETWEEN 2:30 AND 3.**

**Abstract: This talk will cover one aspect of the proof of the
Kervaire invariant theorem (proved with Hill and Hopkins), namely the
gap theorem. It says that \pi_{-2} of a certain spectrum \Omega
vanishes. It is the part of the paper that requires equivariant
methods not available before 2009. It turns out that once the
machinery has been set up, it follows from a surprisingly easy
calculation **

**Restaurant: Kang Suh 1250 Broadway (near 32nd) **

**· Date:
Wed, February 4, 5:30-6:30 Speaker: John R. Klein, Wayne State
University**

**Title: Unlinked Embeddings and Functor Calculus **

**Abstract: This talk will be about the space of codimension zero
embeddings of a Poincare duality space in a disk. I will describe a
tower that interpolates from the space of "Poincare immersions"
to a certain space of "unlinked" Poincare embeddings. The
layers of this tower are described in terms of the coefficient
spectra of the identity appearing in Goodwillie's homotopy functor
calculus. Time permitting, I will relate these layers to the layers
of the tower that appear in the Goodwillie-Weiss manifold calculus. I
will also answer a question posed by Sylvain Cappell.**

**Restaurant: Chennai Garden 127 East 28th Street. Between
Park and LexingtonLink to
Chennai Garden **

**Speaker: Jeremy Miller, Stanford University**

**· Date:
Monday, Sept 29, 4:30-5:30 Title: Representation stability for
homotopy groups of configuration spaces**

**Abstract: In the 1970s, McDuff proved that configuration spaces
of distinct unordered particles in an open manifold exhibit
homological stability. That is, H_i(Conf_k(M)) is independent of k
for k>>i. A natural follow up question is: Do the homotopy
groups also stabilize? From explicit calculations, one can show that
this is not the case. However, in joint work with Alexander Kupers, I
have shown that the rational homotopy groups of configuration spaces
of particles in simply connected manifolds of dimension at least 3
exhibit representation stability in the sense of Church and Farb.
This follows from a more general theorem we prove relating the
homotopy groups and cohomology groups of co-FI-spaces and from the
work of Church on representation stability for the cohomology of
ordered configuration spaces. This result on homotopy groups suggests
that in situations with homological stability, one should not expect
classical stability for homotopy groups. Instead, one should try to
incorporate the fundamental group into the definition of stability. **

**Restaurant: Pippali, 129 E 27th St Link
for Yelp reviews: **

**· Date:
TUESDAY OCTOBER 7, 4:00-5:00 NOTE CHANGE OF DAY AND TIME!**

**Speaker: Don Davis, Lehigh University Title: On the
topological complexity of 2-torsion lens spaces**

**Abstract: The topological complexity of a topological space is
the minimum number of rules required to specify how to move between
any two points of the space. A ``rule'' must satisfy the requirement
that the path varies continuously with the choice of end points. We
use connective complex K-theory to obtain new lower bounds for the
topological complexity of 2-torsion lens spaces. We follow a program
set up by Jesus Gonzalez, and answer a question posed by him. **

**Restaurant: Mandoo Bar 2 W. 32nd Street, between Broadway
and 5th Yelp
review **

**· Date: Wed
October 15, 5:00-6:00 **

**Speaker: Joana Cirici **

**Title: Topology of complex projective varieties with isolated
singularities**

**Abstract: I will explain a homotopical treatment of
intersection cohomology recently developed by
Chataur-Saralegui-Tanre, which associates a "perverse homotopy
type" to every singular space. In this context, there is a
notion of "intersection-formality", measuring the vanishing
of Massey products in intersection cohomology. The perverse homotopy
type of a complex projective variety with isolated singularities can
be computed from the morphism of differential graded algebras induced
by the inclusion of the link of the singularity into the regular part
of the variety. I will show how, in this case, mixed Hodge theory
allows us prove some intersection-formality results (work in progress
with David Chataur).**

**Restaurant: Dhaba Link
to Dhaba 108 Lexington Ave (between 27th St & 28th St)
New York, NY 10016 **

**· Date: Wed
October 22, 5:00-6:00 **

**Speaker: John Mccleary, Vassar College **

**Title: Loop space homology, string homology, and closed
geodesics**

**Abstract: The homology of free loop space of a manifold enjoys
additional structure first identified by Chas and Sullivan. The
string multiplication has been studied by Ralph Cohen and John Jones
and together with J.~Yan, they have introduced a spectral sequence
converging to string homology that is related to the Serre spectral
sequence for the free loop space. Using this tool, and the work of
Felix, Halperin, Lemaire and Thomas, Jones and I establish some
conditions on manifolds that guarantee the existence of infinitely
many closed geodesics on the manifold in any Riemannian metric.
Restaurant: Lalibela Ethiopian Restaurant 37 E 29th St (Between
madison and Park)Lalibela
**

**· Date:
Wed. May 14, 5:00-6:00**

**Speaker: Inna Zakharevich, Institute for Advanced Study**

**Title: Scissors congruence and algebraic K-theory**

**Abstract: Hilbert's third problem asks the following question:
given two polyhedra with the same volume, can we decompose them into
finitely many pairwise congruence pieces? The answer, provided by
Dehn in 1901 is no; there is a second invariant on polyhedra, now
called the Dehn invariant. Classical scissors congruence asks this
question in other dimensions and geometries. In this talk we
construct an abstract framework for discussing scissors congruence
problems using algebraic K-theory. By discarding much of the
geometric underpinning of scissors congruence problems we are able to
construct decomposition invariants in much more general settings,
including Grothendieck rings of arbitrary models. As an application
of this framework we construct a "derived Grothendieck ring of
varieties".**

**Restaurant: La Vie En Szechuan 14 E 33rd St. Link
to La Vie En Szechuan **

**· Date: Wed
May 7, 5:00-6:00**

**Speaker: Rob Thompson, Hunter College/ CUNY Grad Center**

**Title: An unstable Morava change of rings theorem for
Lubin-Tate homology**

**Abstract: The Morava Change of rings theorem is a central
result in stable homotopy theory. For certain spectra it allows one
to compute the E_2-term of the Adams-Novikov Spectral Sequence (i.e.
the Adams spectral based on complex cobordism) in terms of the
E_2-term of the Adams spectral based on various periodic homology
theories like Johnson-Wilson theory (a generalization of topological
K-theory), Morava K-theory ( a generalization of mod p K-theory), and
Lubin-Tate theory (a homology theory based on the theory of lifts of
the Honda formal group law to complete local rings whose residue
fields are F_p algebras). A number of results along these lines in
the unstable realm have been obtained. In this talk I will focus on
the case mentioned in the title. **

**Restaurant: Restaurant: Kokum, 106 Lexinton Ave, between 27th
and 28thA south Indian vegitarian restaurant. Here is the link.
Kokum **

**·****
Date: Wed Apr. 30, 5:00-6:00**

**Speaker: Rita Jimenez Rollan, Northeastern University**

**Title: The cohomology of M_{g,n} and other representation
stability phenomena **

**Abstract: Let M_{g,n} be the moduli space of genus g Riemann
surfaces with n marked points. Given a non negative integer i, we
want to understand how the i-th rational cohomology group of M_{g,n}
changes as the parameter n increases. It turns out that the symmetric
group S_n acts on it and the sequence of S_n-representations
``stabilizes'' in a certain sense once n is large enough. In this
talk I will explain the behavior of this and other examples via the
language of representation stability. Moreover, I will introduce the
notion of a finitely generated FI-module and show our sequence of
interest has this underlying structure which explains the stability
phenomena mentioned above. As a consequence we obtain that, for n
large enough with respect to i, the i-th Betti number of M_{g,n} is a
polynomial in n of degree at most 2i. **

**Restaurant: Hunan Manor. 339 Lexington Ave (at 39th
St.)Link
to NY Times review.**

**Speaker:
Mohamed Abouzaid, Columbia University **

**Title:
Lagrangian immersions and the Floer homotopy type **

· Date: Wed March 26, 5:00-6:00

Speaker: Kate Poirier/ CUNY City Tech

Title: On the higher topological Hochschild homology of F_p and commutative F_p-group algebras

Restaurant:
:Lalibela Ethiopian Restaurant 37 E 29th St (Between madison and
Park)__Lalibela
__

· Date: Wed. Feb 26, 5:00-6:00

Title: A concise construction of differential K-theory

Speaker: Luis Diogo, Columbia University

Title: Symplectic homology from Gromov-Witten theory

· Date: Wed. October 23, 5:00-6:00

Speaker: Sander Kupers, Stanford University

Title: Topological chiral homology and homological stability for completions

Restaurant:
Dhaba __Link
to Dhaba__

108 Lexington Ave (between 27th St & 28th St) New York, NY
10016

·
Date: Wed, October 9, 5:00-6:00

Speaker: Joana Cirici

Title. Rational homotopy of singular complex varieties

Restaurant:
La Vie En Szechuan

14 E 33rd St. __Link
to La Vie En Szechuan __

·
Date Wed May 8 , 5:45- 6:45

Speaker: Joey Hirsh/ CUNY, MIT

Title: Derived Noncommutative Deformation Theory

·
Date Wed April 10 , 5:45- 6:45

Speaker: Jose La Luz. Hostos CC.

Title: THE HIGHER DERIVED FUNCTORS OF THE PRIMITIVE ELEMENT FUNCTOR OF QUASITORIC MANIFOLDS

Title : Is every separated uniform space a limit of metric spaces.

Restaurant:
Bamiyan

358 3rd Ave

Between 26th and 27th

Afghan
Restaurant.__Link
to Bamiyan__

Restaurant:
Franchia - a Vegan, asian restaurant. __Link
to Franchia__

Restaurant : Kang Suh. 1250 Broadway (32nd st).

·
Date: Wed Oct. 3, 5:30-6:30

Speaker: Rob Thompson/ CUNY Hunter
College, Graduate Center

Title:
Homotopy theory from the point of view of cohomology of profinite
groups.

Restaurant: TBA

· April 2 Laurentiu Maxim/Lehman college

· March 26 Nancy Hingston/College of New Jersey

· March 12 Joe Neisendorfer/University of Rochester

Restaurant:
2nd Avenue Deli

Title: Samelson products over loops on H-spaces

· Nov. 14 Bill Singer/Fordham University

· Dec. 5 Don Davis/Lehigh University

· Friday October 19, 10:00-11:00 am John Klein/ Wayne state University

Title: Bundle structures and Algebraic K-theory

· Oct. 3 Jesus Gonzalez/ Centro de Investigacion, Mexico City

· Oct. 25 Tony Bahri/ Rider University

Title:On the relations and homology in the Dehn twist quandle of a surface

· Nov 9, 1:30-2:30, Rm 8405Dennis Sullivan -Cuny Grad. Center

Title: Are the operations in the free loop space of a closed manifold invariants of homotopy type?

· Oct. 26 Hayden Harker,Vasser College

· Oct. 12Don Davis, Lehigh University

· March 23 Selman Akbulut, IAS/MSU

Title:
Topology and Geometry of G_2 manifolds.

Restaurant: TBA

· Feb. 16 Rob Schneiderman, NYU

Title:
Whitney towers and low dimensional topology.

Restaurant: TBA
__Abstract
__

· Dec. 1 Martin Bendersky, CUNY Hunter College/Graduate Center

Title:
A spectral sequence approach to normal forms.

Restaurant: Ben's
Deli

· Nov. 17Craig Westerland, IAS

· Oct. 27 Nancy Hingston, The College of New Jersey

Title:
Subharmonic Solutions of Hamiltonian Equations on Tori__Abstract
__

Restaurant:
TBA

· March 17 Cindy Curtis, The College of New Jersey

Title:
On the SL(2,C)-Casson Invariant.

Restaurant: Kang Suh (1250
Broadway)

Title:
Refined Seiberg Witten Invariant

Restaurant: TBA

· April 28 John McCleary, Vassar College

Title:
Contribution of Hinz Hopf

Restaurant: TBA

· Oct. 15 Lee Mosher, Rutgers University, Newark

Title:
Parageometric Automorphisms of Free Groups.__Abstract__

Restaurant:Kang
Suh (1250 broadway)

· Oct. 29 Katarzyna Potocka, Lehigh University

· November 19Martin Bendersky, CUNY Hunter College/Grad Center

· Oct. 2 John Klein, Wayne State University

Title:Poincare
Duality and Brave New Rings

Restaurant:TBA

Title:
The K-Theory Bousfield Kan Spectral Sequence. Applications and
Generalizations

Restaurant: TBA

Oct. 17 Stephen Bigelow, University of Melbourne

Title: Homology and the Jones Polynomial__Abstract__Oct. 24 Tom Shimkus, Lehigh University

Title: Immersing 2-torsion lens spaces__Abstract__

Title:
Homology decompositions and constructions of group actions.

Restaurant: Da Ciro

Title:
Hopf invariants and periodic orbits of Hamiltonian flows

Restaurant:
TBA

Title:
A model category for algebraic 2-theories __Abstract
__

Restaurant:
TBA