Announcement

• HW4 returned.

• HW4 feedback:
  • Exercise 13.13: Assume $A$ is psd, $x’ A x = 0$ if and only if $Ax = 0$.
  • Exercise 13.19: $A$ and $B$ are psd, show $AB$ has nonnegative eigenvalues.

• HW5+final due 12/11 @ 11:59PM. Turn in to me directly (my office CHS 21-254A) or put into my mailbox at CHS 51-254.

• Course evaluation. Please do it now. http://my.ucla.edu/

Today

• multivariate calculus and optimization, chain rule for Jacobian matrix.