Dear all,
This is a gentle reminder that the deadline for submitting Graded Homework 2 is on Wednesday at 11:59 PM.
Besides, I have added two sets of slides (here and here) at the top of the Moodle page: the first one proving the fact that an "aggregated" Markov chain is not necessarily a Markov chain; the second one showing how to compute 
for the simple symmetric random walk via the so-called "reflection principle".
All the best,
Olivier
