上游充廷大￥ The Envelope Theorem 4 SHANGHAI IIAO TONG UNIVERSITY The Lagrangian function: T=c(区，a)-∑，h,(x,a) When a=ao,The optimal solution x0 satisfies the extremal condition,so: -空低 Ox 2016/12/22• The Lagrangian function: • When a=a 0, The optimal solution x0 satisfies the extremal condition, so: 2016/12/22 14   1 , , l i i i ca h a     x x    00 00   1 , , l i i i ca h a         x x x x The Envelope Theorem 4