By Jeremy Orloff, credited on the first page. Authored course notes in Complex Variables with Applications, MIT 18.04, Spring 2018. Spring 2018 identifies the course offering; no separate note publication or revision date is verified.
Cited passages: §2.5, printed pp. 5–6, one point at infinity and exterior neighbourhoods; §2.5.2, printed p. 7, equatorial unit-sphere projection and north-pole cap. The first page gives the title, author and heading 2 Analytic functions.