Fritz Gesztesy and Barry Simon
Connectedness of the Isospectral Manifold for One-Dimensional Half-Line
Schr\"odinger Operators
(15K, LaTeX)

ABSTRACT.  Let V_0 be a real-valued function on [0,\infty) and V\in L^1([0,R])
for all R>0 so that H(V_0)=  -\f{d^2}{dx^2}+V_0 in L^2([0,\infty))
with u(0)=0 boundary conditions has discrete spectrum bounded from
below. Let \calM (V_0) be the set of V so that H(V) and H(V_0) have
the same spectrum. We prove that \calM(V_0) is connected.