1. The problem statement, all variables and given/known data I was wondering what exactly the difference between a regular (proper? is that the term) hessian is and a bordered hessian. It is difficult to find material in the book or online at this point. I mean mathmatically so that were i to do a problem i would know the layout and what differs between the two. At this point I am aware that a bordered hessian is for constrained optimizations and a proper hessian for unconstrained from there i am unaware where they differ. Theoretically and forumlaically how do they differ? At this point i think it is something like 2. Relevant equations 3. The attempt at a solution Proper Hessian lZxx Zxyl lZyx Zyyl Then you find the determinant A bordered hessian would be l 0 Fx Fy l l Fx Zxx Zxy l l Fy Zyx Zyy l Is that right because it seems too simple.