18.404J/6.840J The Theory of Computation(Fall 2020, MIT OCW). Instructor: Prof. Michael Sipser. This course emphasizes computability and computational complexity theory. Topics include regular and context-free languages, decidable and undecidable problems, reducibility, recursive function theory, time and space measures on computation, completeness, hierarchy theorems, inherently complex problems, oracles, probabilistic computation, and interactive proof systems.
(from ocw.mit.edu)
Introduction; course outline, mechanics, and expectations. Described finite automata, their formal definition, regular languages, regular operations, and regular expressions. Proved that the class of regular languages is closed under ⋃. Started proving closure under.