I met a problem in Lyapunov stability proof:
$\dot{V}\leq -c\delta^T\bigg[\mathbb{T}\bigg((\mathbb{L}+G)\otimes(BR^{-1}B^T)\bigg)\bigg]\delta $
where $\mathbb{T}$ is a symmetric and positive definite matrix. $(\mathbb{L}+G)$ is a positive definite and non-symmetric matrix. $(BR^{-1}B^T)$ is a symmetric and positive definite matrix. $c>0$. $\delta$ is state error vector (tracking problem).
My question is how can I continue to work on that to claim that $\dot{V}<0$?
thanks
Jie