The GST seminar this semester is held at 4:00-5:00 pm on Tuesdays in Avery 351.

1/25/18 Ashley Johnson, U. North Alabama,

1/9/18 Robert Huben, UNL,

12/5/17 Gary DeClerk, UNL,

11/28/17 Andrew Hayes, UNL,

11/14/17 Corbin Groothuis, UNL,

11/7/17 Jesse Moeller, UNL,

10/31/17 Vince Longo, UNL,

10/24/17 Aurora Marks, UNL,

10/10/17 Hannah Schwartz, Bryn Mawr C.,

10/5/17 Ryan Blair, California State U. Long Beach,

10/3/17 Corbin Groothuis, UNL,

9/26/17 Susan Hermiller, UNL,

9/19/17 Robert Huben, UNL,

9/12/17 Alex Zupan, UNL,

9/7/17 Marty Scharlemann, U. California-Santa Barbara,

9/5/17 Mark Brittenham, UNL,

8/29/17 Tye Lidman, North Carolina State U.,

5/11/17 Yago Antolin, U. Autonoma Madrid, Spain,

4/25/17 Jamie Radcliffe, UNL,

4/18/17 Marla Williams, UNL,

4/11/17 Tim Susse, UNL,

4/4/17 Maranda Franke, UNL,

3/29/17 Carolyn Otto, U. Wisconsin - Eau Claire,

3/28/17 Corbin Groothuis, UNL,

3/15/17 Scott Taylor, Colby College,

3/14/17 Katie Tucker, UNL,

3/7/17 Gili Golan, Vanderbilt U.,

2/28/17 Margaret Doig, Creighton U.,

2/21/17 Gary DeClerk, UNL,

2/14/17 Vince Longo, UNL,

2/7/17 Matt Mills, UNL,

1/31/17 Jesse Moeller, UNL,

1/24/17 Aurora Marks, UNL,

1/17/17 (Snow day)

1/9/17 Organizational meeting

11/29/16 Marla Williams, UNL,

11/15/16 Mark Brittenham, UNL,

11/8/16 Corbin Groothuis, UNL,

11/1/16 Ken Baker, U. Miami,

10/25/16 Aurora Marks, UNL,

10/11/16 Maranda Franke, UNL,

10/4/16 Tim Susse, UNL,

9/27/16 Gary DeClerk, UNL,

9/20/16 Vince Longo, UNL,

9/13/16 Meggan Hass, UNL,

9/6/16 Alex Zupan, UNL,

8/30/16 Organizational meeting

8/23/16 Stuart Margolis, Bar-Ilan U.,

7/25/16 Melanie DeVries, MetaCommunications,

4/26/16 Tye Lidman, Inst. for Advanced Study,

4/19/16 Derek Holt, U. Warwick, UK,

4/12/16 Maranda Franke, UNL,

4/5/16 Katie Tucker, UNL,

4/1/16 Mark Brittenham, UNL,

3/29/16 Matt Mills, UNL,

3/15/16 Andy Eisenberg, Oklahoma State U.,

3/8/16 Aaron Calderon, UNL,

3/1/16 Meggan Hass, UNL,

2/23/16 David McCune, William Jewell C.,

2/16/16 Corbin Groothuis, UNL,

2/9/16 Jeff Meier, Indiana U.,

2/2/16 Snow day!

1/19/16, 1/26/16 Nick Owad, UNL,

1/12/16 Organizational meeting

12/1/15 Zoran Sunic, Texas A&M U.,

12/1/15 Zoran Sunic, Texas A&M U.,

11/24/15 Tim Susse, UNL,

11/17/15 Delaram Kahrobaei, CUNY Graduate Center and City Tech,

11/10/15 Kyle Istvan, Louisiana State U.,

11/3/15 George Mossessian, U. California - Davis,

10/27/15 Aaron Calderon, UNL,

10/13/15 Susan Hermiller, UNL,

9/29/15, 10/6/15 Maranda Franke, UNL,

9/22/15 Rob Kirby, U. California - Berkeley,

9/1/15, 9/8/15, 9/15/15 Alex Zupan, UNL,

8/25/15 Organizational meeting

4/24/15 Ashley Johnson, U. North Alabama,

4/14/15 Matt Clay, U. Arkansas,

3/31/15, 4/7/15 Maranda Franke, UNL,

3/10/15, 3/17/15 Nick Owad, UNL,

3/3/15 Yago Antolin Pichel, Vanderbilt U.,

2/17/15, 2/24/15 Robb Todd, U. Nebraska-Omaha,

1/27/15, 2/10/15 Tim Susse, UNL,

12/2/14 Aaron Calderon, UNL,

11/11/14, 11/18/14 John Meakin, UNL,

11/4/14 Anne Kerian, UNL,

10/28/14 Corbin Groothuis, UNL,

10/14/14 Nick Owad, UNL,

10/7/14 Meggan Hass, UNL,

10/3/14 Delaram Kahrobaei, CUNY Graduate Center and City Tech,

9/23/14, 9/30/14 Maranda Franke, UNL,

9/16/14 Allison Beemer, UNL,

9/2/14, 9/9/14 Tim Susse, UNL,

8/26/14 Organizational meeting

4/22/14 Azer Akhmedov, North Dakota State U.,

4/21/14, 4/23/14 Maranda Franke, UNL,

4/15/14 Tim Susse, CUNY Graduate Center,

4/8/14 Jamie Radcliffe, UNL,

3/18/14 Anne Kerian, UNL,

3/4/14, 3/11/14 Nick Owad, UNL,

2/26/14 Conchita Martinez-Perez, U. Zaragoza,

2/14/14 David McCune, William Jewell C.,

2/4/14 Pallavi Dani, Louisiana State U.,

1/21/14 Mark Brittenham, UNL,

12/3/13 Robb Todd, U. Nebraska-Omaha,

11/19/13 Laura Ciobanu, U. Neuchatel,

11/12/13 Melanie DeVries, UNL,

11/5/13 Nora Szakacs, UNL and U. Szeged,

10/29/13 Muhammad Inam, UNL,

10/15/13 John Meakin, UNL,

10/8/13 John Meakin, UNL,

10/1/13 Susan Hermiller, UNL,

9/24/13 Alex Kunin, UNL,

9/17/13 Maranda Franke, UNL,

9/3/13, 9/10/13 Anisah Nu'Man, UNL,

8/27/13 Organizational meeting

4/23/13 Jamie Radcliffe, UNL,

4/9/13 Nathan Corwin, UNL,

4/2/13 Ashley Johnson, UNL,

3/26/13 John Meakin, UNL,

3/12/13 Anisah Nu'Man, UNL,

3/5/13 Robb Todd, U. Nebraska - Omaha,

2/26/13 Muhammad Inam, UNL,

2/19/13 Melanie DeVries, UNL,

2/12/13 Mark Brittenham, UNL,

2/5/13 Ashley Johnson, UNL,

1/29/13 Maranda Franke, UNL,

1/24/13 Morgan Cesa, U. Utah,

1/15/13 Organizational meeting

11/27/12 Melanie DeVries, UNL,

11/6/12, 11/20/12 Ashley Johnson, UNL,

10/30/12 Jamie Radcliffe, UNL,

10/23/12 Anisah Nu'Man, UNL,

10/9/12 John Meakin, UNL,

10/2/12 John Meakin, UNL,

9/25/12, Chad Giusti, UNL,

9/18/12 Chad Giusti, UNL,

9/11/12 Chad Giusti, UNL,

9/4/12 Susan Hermiller, UNL,

8/28/12 Nathan Corwin, UNL,

8/21/12 Organizational meeting

4/17/12 Derrick Stolee, UNL,

4/10/12 Melanie DeVries, UNL,

4/3/12 Ashley Johnson, UNL,

3/27/12 Nathan Corwin, UNL,

3/13/12 Emily Ognacevic, UNL,

3/6/12 Anne Kerian, UNL,

2/21/12, 2/28/12 John Meakin, UNL,

2/14/12 Anisah Nu'Man, UNL,

1/24/12, 1/31/12 Mark Brittenham, UNL,

1/17/12 Robb Todd, U. Nebraska - Omaha,

1/10/12 Organizational meeting

11/15/11 Jamie Radcliffe, UNL,

11/8/11 Emily Ognacevic, UNL,

11/1/11 Mark Brittenham, UNL,

10/25/11 Mark Brittenham, UNL,

10/11/11 Nathan Corwin, UNL,

9/20/11, 9/27/11, 10/4/11 Susan Hermiller, UNL,

8/30/11, 9/6/11, 9/13/11 Ashley Johnson, UNL,

8/23/11 Pascal Weil, U. Bordeaux,

4/26/11 Melanie DeVries, UNL,

4/19/11 Carly Klivans, U. Chicago,

4/12/11 David McCune, UNL

4/5/11 Susan Hermiller, UNL,

3/29/11 Ashley Weatherwax, UNL,

3/15/11 Ashley Weatherwax, UNL,

3/8/11 Susan Hermiller and Mark Britteham, UNL,

3/1/11 Mark Britteham and Susan Hermiller, UNL,

2/22/11 Mark Brittenham and David McCune, UNL,

2/15/11 David McCune, UNL,

2/8/11 Susan Hermiller, UNL,

2/1/11 Jamie Radcliffe, UNL,

1/25/11 Organizational meeting

1/18/11 Andrew Duncan, U. Newcastle, UK,

11/23/10 Zoran Sunic, Texas A&M U.,

11/16/10 Melanie DeVries, UNL,

11/9/10 Susan Hermiller, UNL,

11/2/10 Mark Brittenham, UNL,

10/26/10 Nathan Corwin, UNL,

10/12/10 Robb Todd, U. Nebraska - Omaha,

9/28/10 Ashley Weatherwax, UNL,

9/21/10 Lucas Sabalka, Binghamton U.,

9/7/10, 9/14/10 David McCune, UNL,

8/31/10 Jamie Radcliffe, UNL,

8/24/10 Organizational meeting

4/27/10 Vladimir Itskov, UNL,

4/20/10 Mark Brittenham, UNL,

4/13/10 Collin Bleak, UNL,

4/6/10 David McCune, UNL,

3/30/10 Susan Hermiller, UNL,

3/23/10 Susan Hermiller, UNL,

3/8/10 Violeta Vasilevska, U. South Dakota,

3/2/10 David McCune and Mark Brittenham, UNL,

2/24/10 Mark Brittenham, UNL,

2/17/10 Bob Ruyle, UNL,

2/10/10 Melanie DeVries, UNL,

2/3/10 Nathan Corwin, UNL,

1/26/10 Ashley Weatherwax, UNL,

1/12/10 Organizational meeting

11/24/09, 12/1/09 David McCune, UNL,

11/19/09 David Yetter, Kansas State U.,

11/10/09 Robb Todd, U. Nebraska - Omaha,

10/27/09 Susan Hermiller, UNL,

10/13/09 David McCune, UNL,

10/6/09 Mark Brittenham, UNL,

9/29/09 Collin Bleak, UNL,

9/22/09 Collin Bleak, UNL,

9/15/09 Collin Bleak, UNL,

9/1/09, 9/8/09 Robb Todd, U. Nebraska - Omaha,

8/24/09 Organizational meeting

4/21/09, Violeta Vasilevska, U. South Dakota,

4/14/09 Robb Todd, U. Nebraska - Omaha,

3/31/09, 4/7/09 Susan Hermiller, UNL,

3/24/09 Robb Todd, U. Nebraska - Omaha

3/3/09 Collin Bleak, UNL,

2/24/09 Mark Brittenham, UNL,

2/19/09 Said Sidki, U. Brasilia, Brazil,

1/20/09, 1/27/09, 2/3/09 John Meakin, UNL,

1/13/09 Organizational meeting

12/2/08 Mark Brittenham, UNL,

11/18/08, 11/25/08 Scott Dyer, UNL,

11/4/08, 11/11/08 Robb Todd, U. Nebraska - Omaha,

10/28/08 Mark Brittenham, UNL,

10/14/08 Olga Patricia Salazar Diaz, Universidad Nacional de Colombia,

10/7/08 Bob Ruyle, UNL,

9/30/08 Collin Bleak, UNL,

9/23/08 Jamie Radcliffe, UNL,

9/16/08 Collin Bleak, UNL,

9/9/08 Andrew Ray, UNL,

9/2/08 David McCune, UNL,

8/26/08 Organizational meeting

5/8/08 Robb Todd, U. Nebraska - Omaha,

4/15/08, 4/22/08 Bob Ruyle, UNL,

4/8/08 Sarah Rees, U. Newcastle, UK,

4/4/08 Jen Taback, Bowdoin College,

4/3/08 Jen Taback, Bowdoin College,

3/28/08 Ben Fine, Fairfield U./CAISS-CUNY,

3/24/08 Robb Todd, U. Nebraska - Omaha,

3/11/08 Collin Bleak, UNL,

3/4/08 Robb Todd, U. Nebraska - Omaha,

2/26/08 David McCune, UNL,

2/12/08, 2/19/08 Susan Hermiller, UNL,

1/29/08 David McCune, UNL,

1/22/08 Collin Bleak, UNL,

1/15/08 Collin Bleak, UNL,

11/9/07, 11/16/07 Scott Dyer, UNL,

10/19/07, 10/26/07, 11/2/07 Collin Bleak, UNL,

9/28/07, 10/5/07 Collin Bleak, UNL,

9/14/07, 9/21/07 Robb Todd, U. Nebraska - Omaha,

8/31/07, 9/7/07 Mark Brittenham, UNL,

1/30/07, 2/6/07 Scott Dyer, UNL,

1/16/07 Organizational Meeting

11/28/06 Aditi Kar, UNL,

11/14/06, 11/21/06 Mark Brittenham, UNL,

10/31/06, 11/7/06 Scott Dyer, UNL,

10/3/06, 10/10/06 Susan Hermiller, UNL,

9/26/06 John Meakin, UNL,

9/12/06, 9/19/06 Jamie Radcliffe, UNL,

8/29/06, 9/5/06 David Milan, UNL,

8/22/06 Organizational Meeting

8/4/06 Pascal Weil, U. Bordeaux, France,
* On the complexity of the Whitehead minimization problem*

3/21/06 Nikolay Nikolov, U. Oxford, Great Britain,
*Counting groups, primes and manifolds*

3/7/06 Susan Hermiller, UNL,
*Tame combings and almost convexities*

2/21/06, 2/28/06 Susan Hermiller, UNL,
*Minimal almost convexity is generating set dependent, I-II*

1/24/06, 1/31/06 Mark Brittenham, UNL,
*Morton's amazing almost equality, I-II*

1/17/06 Aditi Kar, UNL,
*The equivalence of some residual properties of hyperbolic groups, II*

11/29/05 Nikolay Nikolov, U. Oxford, Great Britain,
*Subgroups of finite index in profinite groups*

11/15/05 Aditi Kar, UNL,
*Residual properties of hyperbolic groups, I*

10/25/05, 11/1/05, 11/8/05 David Milan, UNL,
*The C*-algebras of some inverse semigroups, I-III*

9/27/05, 10/5/05 Justin James, UNL,
*Deciding membership in finitely generated submonoids of the free
product of two groups, I-II*

9/13/05, 9/20/05 John Meakin, UNL,
*From submonoids of groups to inverse monoids, I-II (II:
Toeplitz inverse monoids)*

9/6/05 Justin James, UNL,
*An algorithm to decide membership in finitely generated submonoids of
free abelian groups*

5/25/05 Zoran Sunik, Texas A&M,
*Thompson's group F and the weak Bruhat order*

4/19/05 Susan Hermiller, UNL,
*Artin groups, 3-manifolds, and rewriting systems*

3/29/05 Bob Ruyle, UNL,
*Bass-Serre theory and foldings*

3/22/05 Stuart Margolis, Bar-Ilan U., Hunter College and Queens College,
*Inverse monoids, logic and the
computational complexity of root subgroups in free groups*

2/1/05, 2/8/05, 3/15/05 Bob Ruyle, UNL,
* Foldings in graphs of groups and the
membership problem for subgroups of graphs of groups, I-III*

1/18/05, 1/25/05 Justin James, UNL,
*The power problem and the
double power problem in word hyperbolic groups*

12/7/04 Patrick Bahls, U. Illinois Urbana-Champaign,
*Orderability in groups and monoids: truths and consequences*

11/23/04, 11/30/04 Susan Hermiller, UNL,
*Geodesics, star-free languages, and small cancellation groups, I-II*

11/16/04 Aditi Kar, UNL,
*Finite subgroups of hyperbolic groups*

11/2/04, 11/9/04 John Meakin, UNL,
*Idempotent generated semigroups, I-II*

10/12/04, 10/26/04 Bob Ruyle, UNL,
*The Hanna Neumann Conjecture for free groups and a
Matching Problem for finite groups, I-II*

9/22/04 Sarah Rees, U. Newcastle, UK,
*Groups whose co-word problem is context-free*

9/14/04, 9/21/04 Jamie Radcliffe, UNL,
*An old application of topology to Ramsey theory, I-II*

8/31/04, 9/7/04 Mark Brittenham, UNL,
*Canonical decompositions of 3-manifolds (and their
fundamental groups), I-II*

6/8/04, 6/9/04, 6/10/04 Lucas Sabalka, U. Illinois Urbana-Champaign,
*Braid groups on graphs, I-III*

6/8/04 Mark Brittenham, UNL, *Background on Morse theory*

5/11/04 Alexei Myasnikov, City College/CUNY,
*Different faces of fully residually free groups
and algorithmic problems*

4/27/04 Zoran Sunik, Texas A&M,
*Hausdorff dimension of groups acting on trees*

4/20/04 Chris Bourke, UNL Dept. of Computer Science and Engineering,
*Finite-state dimension of individual sequences*

4/13/04 Susan Hermiller, UNL,
*Polyfree constructions for Artin groups*

3/30/04, 4/6/04 Justin James, UNL,
*Syntactic groups of finitely generated submonoids, I-II*

3/23/04 David Milan, UNL,
*Topologically unrealizable automorphisms*

2/17/03, 2/24/04, 3/9/04 Enric Ventura, UNL/Universitat Politecnica de
Catalunya, Barcelona, Spain,
*Fixed subgroups in free groups, I-III*

2/6/04 Louis Zulli, Lafayette College,
*An extension of the Jones polynomial of classical knots*

1/27/04 Susan Hermiller, UNL,
*Thompson's group at 40 years*

1/20/03 Enric Ventura, UNL/Universitat Politecnica de
Catalunya, Barcelona, Spain,
*A uniform version for non-amenability*

11/25/03 Jamie Radcliffe, UNL,
*Midterm problems for the human race*

11/18/03 Josh Brown-Kramer, UNL,
*The falsification by fellow traveler property*

10/28/03, 11/4/03, 11/11/03 Mark Brittenham, UNL,
*Train tracks for free groups, I-III*

9/30/03, 10/7/03, 10/14/03 Justin James, UNL,
*Coxeter groups, I-III*

9/9/03, 9/16/03, 9/23/03 Pascal Weil, UNL/U. Bordeaux, France,
*Logic and automata, I-III*

9/2/03 Enric Ventura, Universitat Politecnica de
Catalunya, Barcelona, Spain,
*Modern consequences of the classical theorem of Takahasi*

**Focus semester on**
"*From fractal groups to fractal sets*" by Bartholdi, Grigorchuk, and
Nekrashevych

4/29/03 Zoran Sunik, UNL,
*Self-similarity and and hyperbolic spaces*

4/15/03, 4/22/03 Zoran Sunik, UNL,
*Schreier graphs and self-similar actions, I-II*

4/7/03 John Meier, Lafayette College,
*Garside groups*

4/1/03 Jamie Radcliffe, UNL,
*Virtual endomorphisms*

3/11/03, 3/25/03 Mark Brittenham, UNL,
*Iterated monodromy groups, I-II*

3/7/03 Rostislav Grigorchuk, Texas A&M,
*A friendly competitor to the Thompson group*

2/25/03, 3/4/03 Steve Lindblad, UNL,
*Actions on rooted trees, I-II*

2/11/03 Jamie Radcliffe, UNL,
*Groups and inverse semigroups associated with Penrose tilings*

2/4/03 John Meakin, UNL,
*Self similar actions of inverse semigroups*

1/21/03, 1/28/03 John Meakin, UNL,
*Self similar actions of groups and semigroups, I-II*

12/10/02 Justin James, UNL,
*Closure properties of quasiconvex subsets of word hyperbolic groups*

11/26/02 Bob Ruyle, UNL,
*Calculating the Schutzenberger graphs of a transition monoid*

11/12/02 Mark Brittenham, UNL,
*Branched surfaces, tilings, and the carrying problem*

11/5/02 Steve Lindblad, UNL,
*Sparse words and Schutzenberger complexes*

10/29/02 Vinod Variyam, UNL Dept. of Computer Science and Engineering,
*Complexity of group-theoretic problems*

10/15/02 Susan Hermiller, UNL,
*Minimal almost convexity*

10/8/02 Bob Ruyle, UNL,
*Malcev correspondence between rings and nilpotent groups*

9/17/02 Steve Haataja, UNL,
*Inverse semigroups associated with Wiener-Hopf algebras*

9/10/02 John Meakin, UNL,
*Inverse monoids associated with submonoids of groups*

8/27/02, 9/3/02 Zoran Sunik, UNL,
*Test maps to metabelian groups, I-II*

4/23/02 Mark Brittenham, UNL,
*Are "most" knots really the boundary of only one
surface? Some (bad) empirical evidence*

4/16/02 John Snow, Concordia U.,
*Constructing congruence lattices of finite algebras*

4/9/02 Lucas Sabalka, UNL,
*Geodesic growth in the braid group on three strands*

4/2/02 Justin James, UNL,
*A solution to the cyclic submonoid membership problem for
a class of Coxeter groups*

3/26/02 Zoran Sunik, UNL,
*Baumslag-Solitar groups as dual finite automata*

2/19/02, 3/5/02, 3/12/02 Mark Brittenham, UNL,
*3-manifolds with finite fundamental group, I-III*

2/12/02 Zoran Sunik, UNL,
*Periodic points of tree endomorphims, the Catalan family tree and Young
tableaux*

2/5/02 Mark Sapir, Vanderbilt U.,
*Higman embeddings*

1/29/02 John Snow, Concordia U.,
*Algebras, relations, compatibility, and majority*

1/22/02 John Meakin, UNL,
*Equations in free inverse monoids II: the extendibility problem*

1/15/02 John Meakin, UNL,
*Equations in free inverse monoids*

10/26/01 Jean-Camille Birget, Rutgers U. Camden,
*Filling functions on groups*

10/16/01, 10/30/01, 11/6/01 Justin James, UNL,
*Coxeter groups and the generalized word problem, I-III*

10/2/01, 10/9/01 Steve Lindblad, UNL,
*Knuth-Bendix for groups with infinitely many rules, I-II*

9/18/01 Zoran Sunik, UNL,
*Groups of tree automorphisms: Introduction to branch groups*

9/11/01 Zoran Sunik, UNL,
*Groups of tree automorphisms: Algorithmic aspects*

9/4/01 Zoran Sunik, UNL,
*Groups of tree automorphisms: Word and torsion growth*

4/10/01, 4/24/01 Justin James, UNL,
*The quasiconvexity reduction hypothesis and its applications, I-II*

3/27/01, 4/3/01 Susan Hermiller, UNL,
*Homology for groups and monoids, I-II*

3/20/01 Andrei Kelarev, UNL/U. Tasmania,
*Cayley graphs of groups and semigroups*

3/2/01 Murray Elder, Texas A&M,
*Patterns theory and automatic groups*

2/20/01, 2/27/01 Steve Haataja and Justin James, UNL,
*The perimeter of 2-complexes in coherent groups, I-II*

2/6/01, 2/13/01 Bob Ruyle, UNL,
*Finite inverse monoids and first order theory of free groups, I-II*

1/30/01 Andrei Kelarev, UNL/U. Tasmania,
*Combinatorial properties of groups and semigroups*

1/16/01, 1/23/01 Lisa Orlandi-Korner, UNL,
*Outer space, I-II*

11/28/00, 12/5/04 Steve Hataaja, UNL,
*Non-positively curved triangles of groups, I-II*

11/21/00 Justin James, UNL,
*The Rips trick*

11/7/00, 11/14/00 Lisa Orlandi-Korner, UNL,
*The *real* Bieri-Neumann-Strebel invariant*

10/10/00, 10/31/00 Casey Mann, UNL/U. Arkansas,
*Heesch, Einstein, and dominoes -- Open questions in tiling, I-II*

10/3/00 Mark Brittenham, UNL,
*Building Seifert surfaces with depth > 1 -
and why BNS invariants help*

9/26/00 Mark Brittenham, UNL,
*BNS invariants for 1-relator groups -
and why a knot theorist would care*

9/12/00, 9/19/00 Susan Hermiller, UNL,
*Coxeter groups and their geodesics, I-II*

8/29/00 Alessandra Cherubini, Politecnico di Milano, Italy,
*Families of languages contained or containing context-free languages*

8/22/00, 9/5/00 John Meakin, UNL,
*Geodesics in surface groups, I-II*

8/9/00 Jean-Camille Birget, Rutgers U. Camden

7/31/00 Pascal Weil, U. Bordeaux, France

7/26/00 Susan Hermiller, UNL,
*N ^{3}*

7/24/00 Jillian Mcleod, UNL

7/12/00, 7/17/00, 7/19/00 Stuart Margolis, Bar-Ilan U., Israel

**Focus semester on tilings and tiling groups**

4/10/00 Mark Brittenham, UNL,
*Actions by isometries, tilings, laminations, and the kitchen sink*

4/3/00 Susan Hermiller, UNL,
*Conway's tiling groups*

3/20/00, 3/27/00 John Meakin, UNL,
*The inverse semigroup of a tiling of R ^{n}*

3/6/00 Mark Brittenham, UNL,

2/7/00 Lisa Orlandi-Korner, UNL,

1/31/00 Lois Goss, UNL,

11/30/99 John Meakin, UNL,
*Subgroups of free groups: a theorem of Marshall Hall*

11/9/99, 11/16/99 Jamie Radcliffe, UNL,
*Asphericity for groups, I-II*

11/2/99 Mark Brittenham, UNL,
*There is no algorithm to decide if a group is the fundamental
group of a 3-manifold (after Stallings)*

10/26/99 John Meakin, UNL,
*Asphericity and the Freiheitssatz for some finitely presented groups*

10/5/99, 10/12/99 John Meakin, UNL,
*One-relator groups and one-relator monoids, I-II*

9/7/99 Sarah Rees, U. Newcastle,
*Solving the word problem in real time*

8/31/99, 9/14/99, 9/21/99, 9/28/99 Susan Hermiller, UNL,
*Tame combings for groups, I-IV*

4/23/99 Jon McCammond, Texas A&M,
*The combinatorial Gauss-Bonnet theorem and the notion of
curvature in group theory*

4/14/99, 4/28/99 Bob Ruyle, Nebraska Wesleyan U.,
*The Kervaire Conjecture and accidental group theory, I-II*

3/24/99, 3/31/99, 4/7/99 Jamie Radcliffe, UNL,
*Bieri-Neumann-Strebel invariants for one-relator groups, I-III*

3/10/99 Lisa Orlandi-Korner, UNL,
*The Bieri-Neumann-Strebel invariant*

2/17/99 Susan Hermiller, UNL,
*Some geometric topology for group theorists*

2/10/99 Mark Brittenham, UNL,
*Seifert groups acting on the real line*

1/20/99, 1/27/99, 2/3/99 Mark Brittenham, UNL,
*Characterizing some groups which act on the real line, I-III*

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