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In [1], we showed contractivity of reaction-diffusion PDE: \frac{\partialu}{\partial t}({\omega},t) = F(u({\omega},t)) + D\Delta u({\omega},t) withNeumann boundary condition, provided \mu_{p,Q}(J_F (u)) < 0 (uniformly on u),for some 1 \leq p \leq \infty and some positive, diagonal matrix Q, where J_Fis the Jacobian matrix of F. This note extends the result for Q weighted L_2norms, where Q is a positive, symmetric (not merely diagonal) matrix andQ^2D+DQ^2>0.

Remarks on contractions of reaction-diffusion PDE's on weighted L^2 norms