Philosophy
Gettier Problems and the Analysis of Knowledge
Quick fact
Edmund Gettier's 1963 paper, 'Is Justified True Belief Knowledge?', is just three pages long yet has generated thousands of books and articles in response, making it one of the most influential philosophy papers of the 20th century.
Why this is interesting
Imagine you're absolutely certain of something, and you're right—but you're only right by pure luck. Do you actually know it? This is the strange puzzle Gettier introduced.