Recent content by sunon77

For a general dynamic system: dXi/dt = Fi(X1, X2,...,Xn), i=1,...,n, Q.1 do you have some ideas of the existence conditions of following PDE: a) (grad U, grad U + F) = 0 in n-dimension domain, (,) is inner product; b) U >=0 Does it need a first type or second type of boundary...