For those interested in the lecture associated with these notes: <a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=GNc1t6Q5Dls" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=GNc1t6Q5Dls</a>