The common errors on Assign 2 are as follows:

1. For question 1.3.1, most students mentioned that the inclusion is possible if and only if the normals to the hyperplanes are in the same direction, but only a few actually proved it. 2 marks were taken off in that case.
2. For question 2.3.6, nobody gave the right answer. 2 marks were taken off from the ones that mentioned just something like positive definiteness of A.