3. What about demand function Duality indicate that HD1 and concave is what the convex tech need for the cost What about the other function such as factor demand function g(w, q is HDO and ag, (w, q) is symmetric C negative semidefinite. Then it is the conditional factor demand function of a certain tech lectured for Chu Kechen Honors Collegelecture4 for Chu Kechen Honors College 3.what about demand function ▪ Duality indicate that HD1 and concave is what the convex tech need for the cost. ▪ What about the other function, such as factor demand function. ▪ is HD0 and is symmetric negative semidefinite. Then it is the conditional factor demand function of a certain tech. g w( , ) q ( , ) i j g q w           w