Some positive differences of products of Schur functions
Abstract
The product
s
μ
s
ν
of two Schur functions is one of the most famous examples of a Schur-positive function, i.e. a symmetric function which, when written as a linear combination of Schur functions, has all positive coefficients.
We ask when expressions of the form
s
λ
s
ρ
−
s
μ
s
ν
are Schur-positive. This general question seems to be a difficult one, but a conjecture of Fomin, Fulton, Li and Poon says that it is the case at least when
λ
and
ρ
are obtained from
μ
and
ν
by redistributing the parts of
μ
and
ν
in a specific, yet natural, way. We show that their conjecture is true in several significant cases. We also formulate a skew-shape extension of their conjecture, and prove several results which serve as evidence in favor of this extension. Finally, we take a more global view by studying two classes of partially ordered sets suggested by these questions.