Contents
Introduction vii
Moduli Spaces of Curves with Effective r-Spin Structures
A. POLISHCHUK 1
A Construction of Witten's Top Chern Class in
K-
Theory
ALESSANDRO CHIODO 21
Witten's Conjecture and the Virasoro Conjecture
for Genus up to Two
Y.-P. LEE 31
ldempotents on the Big Phase Space
XIAOBO LIU 43
Singularities with Symmetries, Orbifold Frobenius Algebras and Mirror
Symmetry
RALPH M. KAUFMANN 67
The Cohomology Ring of Crepant Resolutions of Orbifolds
YONGBIN RUAN 117
Differential Characters on Orbifolds and String Connections I: Global Quotients
ERNESTO LUPERCIO and BERNARDO URIBE 127
HKR characters and higher twisted sectors
JACK MORAVA 143
Combinatorics of Binomial Decompositions of the Simplest Hodge Integrals
S. V. SHADRIN 153
The Orbifold Cohomology of the Moduli of Genus-Two Curves
JAMES SPENCER 167
List of Participants and Abstracts 185
v
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