
 The 2. Midterm took place Tuesday 4/7, from 78:30pm in Hall C. The average score was 75. The standard deviation 13.
 We had a global review on Sunday at 78:30 PM in Hall B. Here are the slides [PDF].
 Sunday 4/5 3 PM: Practice I, Problem 6, A^{T} b = [ 13,1]^{T}. Final result unchanged.
Thanks to Jason Rosenfeld.
 Monday 4/6 6:30 AM: Practice V, Problem 9b, mixup of B and A in the answer to B. Thanks to Wilson Wu.
 Monday 4/6 7 AM: Practice I, Problem TF 8, example is given for AB, not A+B. Thanks to Jim Danz
 Monday 4/6 4 PM: Practice I, Problem 9, v_{3} had a typo in the sign. End result is correct. Thanks to Jim Danz
 Tuesday 4/7 5 PM: Practice V,Problem 6, an entry in the matrix S was wrong. Thanks to Xuemei Zhai
