The spectral mean value for linear forms in twisted coefficients of cusp forms
Bringmann, Lovejoy, and Osburn (2009, 2010) showed that the generating functions of the spt-overpartition functions , , , and M2spt(n) are quasimock theta functions, and satisfy a number of simple Ramanujan-like congruences. Andrews, Garvan, and Liang (2012) defined an spt-crank in terms of weighted vector partitions which combinatorially explain simple congruences modulo 5 and 7 for spt(n). Chen, Ji, and Zang (2013) were able to define this spt-crank in terms of ordinary partitions. In this...
This paper classifies the strongly perfect lattices in dimension . There are up to similarity two such lattices, and its dual lattice.
We assign to each pair of positive integers and a digraph whose set of vertices is and for which there is a directed edge from to if . We investigate the structure of . In particular, upper bounds are given for the longest cycle in . We find subdigraphs of , called fundamental constituents of , for which all trees attached to cycle vertices are isomorphic.