Announcement

• HW6 (long), due Fri 12/1 @ 11:59pm.

Today

• SVD (cont’d).

Q\&A

• Proof of existence of SVD.

• HW5, Q6.2. Hint: Think about the forward substitution to show that the $j$-th column of the inverse must have zeros before its $j$-th entry.

• HW6, Q3.3(a): concrete example?

• HW6, Q4.