Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

a mathematician's apology is a book about mathematics which was written in 1940.
a mathematician's apology

louis meyers (1955 or 1956 – march 11, 2016) was a american festival organizer and co-founder of south by southwest.
louis meyers

fair use is the idea that it should be okay for a person to reuse something that another person has created, in certain amounts and for certain purposes, without breaking the law.

fair use