Preprint versions, pdf files

**Filtered
geometric lattices and Lefschetz section theorems over the
tropical semiring****
(with K. Adiprasato), preprint 2014 (28 pp).
(Also at**

**A
cell complex in number theory****
Preprint 2009 (16 pp)
**

**(Also at ****http://arXiv.org/abs/1101.5704
****)**

**On
sequentially Cohen-Macaulay complexes and posets ****(with M. Wachs and V. Welker)**

**Preprint 2007 (19 pp) **

*Israel Journal of Mathematicss *169 (2009),
295--316.

**(Also at ****http://arXiv.org/math/0702788
****)**

**Connectivity
of chamber graphs of buildings and related complexes (with
K. Vorwerk) **

Preprint 2009 (14 pp)

*Europ. J. Combinatorics *31 (2010), 2149--2160.

(Also at **http://arXiv.org/abs/0907.0325 ****)**

**A
q-analogue of the FKG inequality and some applications **

Preprint 2009 (11 pp)

*Combinatorica *31 (2011), 151--164.

(Also at **http://arXiv.org/abs/0906.1389 ****)**

**Note:
Random-to-front shuffles on trees **

Preprint 2008 (6 pp)

*Electronic Comm. in Probability *14 (2009), 36--41.

(Also at **http://arXiv.org/abs/0901.4278 ****)**

**Random
walks, arrangements, cell complexes, greedoids, and
self-organizing libraries **

Preprint 2008 (30 pp)

In *"Building bridges --- the Lov'asz Festschrift" *(eds.
M. Groetschel and G. O. H. Katona),

Bolyai Soc. Math. Studies 19 (2008), Springer, Berlin and
Budapest, pp. 165--203.

(Also at **http://arXiv.org/abs/0805.0083 ****)**

**Appendix
to "Hyperplane arrangements and box splines" by C. De
Concini and C. Procesi **

Preprint 2007 (4 pp)

*Michigan Math. Journal *57 (2008), 221--225.

**On
sequentially Cohen-Macaulay complexes and posets ****(with
M. Wachs and V. Welker)
Preprint 2007 (19 pp)
**

**Combinatorial
Alexander duality --- a short and elementary proof ****(with
M. Tancer)
Preprint 2007 (7 pp)
**

**A
comparison theorem for $f$-vectors of simplicial polytopes **

Preprint 2006 (8 pp)

*Pure and Applied Mathematics Quarterly *3 (2007),
347--356.

(Also at **http://arXiv.org/math/0605336 ****)**

**Rationality
of the M\"obius function of a composition poset ****(with
B. E. Sagan)
Preprint 2005 (20 pp)
**

**An
analogue of Young’s lattice for compositions ****(with R. P. Stanley)
Preprint 2005 (20 pp)
**

**On
the shape of Bruhat intervals ****(with T.
Ekedahl)
Preprint 2005 (15 pp)
**

**Topological
Combinatorics **

Slides from lecture given at the R. MacPherson 60th birthday
symposium,

IAS, Princeton, October 2004.

**Chain
polynomials of distributive lattices are 75 % unimodal ****(with
J. D. Farley)
Preprint 2004 (7 pp)
**

**A
note on blockers in posets ****(with A.
Hultman)
Preprint 2004 (11 pp)
**

**Subspace
arrangements defined by products of linear forms ****(with
I. Peeva and J. Sidman)
Preprint 2003 (20 pp)
**

**Bier
spheres and posets ****(with A. Paffenholz,
J. Sj\"ostrand and G. M. Ziegler)
Preprint 2003 (15 pp)
**

**Segre
and Rees products of posets, with ring-theoretic
applications ****(with V. Welker)
Preprint 2003 (12 pp) Journal of Pure and Applied Algebra 198
(2005), 43--55.
(Also at **

**Poset
fiber theorems**** (with M. Wachs and V.
Welker)
Preprint 2002 (30 pp)
**

**Nerves,
fibers and homotopy groups,****
Preprint 2002 (6 pp)
**

**Neighborhood
complexes of stable Kneser graphs**** (with M.
de Longueville)
Preprint 2001 (12 pp)
**

**Geometrically
constructed bases for homology of partition lattices of
types $A$, $B$ and $D$ ****(with
M. Wachs)
Preprint 2001 (29 pp) (Also at **

**Simplicial
manifolds, bistellar flips and a 16-vertex triangulation of
the Poincare homology 3-sphere**** (with F. H. Lutz)
Preprint 1999 (22 pp)
**

**Face
numbers of Scarf complexes****
Preprint 1998 (12 pp)
**

**A
combinatorial miscellany**** (with R. P.
Stanley)
Preprint 1998 (93 pp)**

**Complexes
of directed graphs**** (with V. Welker)
Preprint 1998 (13 pp)
**

**Complexes
of not $i$-connected graphs**** (with E.
Babson, S. Linusson, J. Shareshian and V. Welker)
Preprint 1997 (28 pp)
**

**The
number of k-faces of a simple d-polytope****
(with S. Linusson)
Preprint 1997 (16 pp)
**

**Subspace
arrangements over finite fields**** (with T.
Ekedahl)
Preprint 1996 (26 pp)
**

**Topological
Methods****
in ``Handbook of Combinatorics'' (eds. R. Graham, M. Gr\"otschel
and L. Lov\'asz),
North-Holland, Amsterdam, 1995, pp. 1819--1872.**

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