Singular Loci of Schubert Varieties

[see attached for complete text] {it Singular Loci of Schubert Varieties} is a unique work at the crossroads of representation theory, algebraic geometry, and combinatorics. Over the past 20 years, many research articles have been written on the subject in notable journals. In this work, the authors have recreated and restructured the various theories and approaches of those articles and present a clearer understanding of this important subdiscipline of Schubert varieties---namely singular loci. Key features of this work include: