User:Lianghongjing/sandbox

http://en.wikipedia.org/wiki/Dini_derivative http://en.wikipedia.org/wiki/Lyapunov_stability http://en.wikipedia.org/wiki/Convex_hull http://en.wikipedia.org/wiki/Semi-continuity http://en.wikipedia.org/wiki/Laplacian_matrix http://en.wikipedia.org/wiki/Markov_chain#Reducibility http://en.wikipedia.org/wiki/Luenberger_observer http://en.wikipedia.org/wiki/Dirac_delta_function#cite_note-20