38 research outputs found
The Isaacs–Navarro conjecture for the alternating groups
AbstractA recent refinement of the McKay conjecture is verified for the case of the alternating groups. The argument builds upon the verification of the conjecture for the symmetric groups [P. Fong, The Isaacs–Navarro conjecture for symmetric groups, J. Algebra 250 (1) (2003) 154–161]
The number of self-conjugate core partitions
A conjecture on the monotonicity of t-core partitions in an article of
Stanton [Open positivity conjectures for integer partitions, Trends Math.,
2:19-25, 1999] has been the catalyst for much recent research on t-core
partitions. We conjecture Stanton-like monotonicity results comparing
self-conjugate (t+2)- and t-core partitions of n.
We obtain partial results toward these conjectures for values of t that are
large with respect to n, and an application to the block theory of the
symmetric and alternating groups. To this end we prove formulas for the number
of self-conjugate t-core partitions of n as a function of the number of
self-conjugate partitions of smaller n. Additionally, we discuss the positivity
of self-conjugate 6-core partitions and introduce areas for future research in
representation theory, asymptotic analysis, unimodality, and numerical
identities and inequalities.Comment: 17 pages, 2 figures, to appear in Journal of Number Theory Updated to
accepted version. Removed previously known results about self-conjugate
7-cores and corrected other historical informatio