While preparing for the exam, i came across these problems with the model answers for Assignment 1: Question 7 and 12.
Pg16 of Cohen states that the closure of the empty language contains the null string. Model answer for Q16 (option1) of assignment 1 also states this; which contradicts the model answer for Q7.
The model answer lists the 3rd option as correct where S* != T*; however the question was where S* = T*
Hopefully we will have up to 0.25% added to our final year mark because of this.
I have emailed the lecturers and will post their feedback.