Title: Stability of the sum of two solitary waves for (gDNLS) in the energy space,
Abstract: In this paper, we continue the study in \cite{MiaoTX:DNLS:Stab}. We use the
perturbation argument, modulational analysis and the energy argument in
\cite{MartelMT:Stab:gKdV, MartelMT:Stab:NLS} to show the stability of the sum
of two solitary waves with weak interactions for the generalized derivative
Schrödinger equation (gDNLS) in the energy space. Here (gDNLS) hasn't the
Galilean transformation invariance, the pseudo-conformal invariance and the
gauge transformation invariance, and the case $\sigma>1$ we considered
corresponds to the $L^2$-supercritical case.