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La Habitación de Fermat (2007)

A stranger using the alias "Fermat" invites several people to attend a convention of the country's best mathematicians. To accept the invitation, each must solve a math puzzle. Upon receipt of the correct solution, each receives as an alias the name of a famous mathematician or philosopher; they are forbidden to reveal their true identities. Each is instructed to arrive at a specific place and time, alone and without a cell phone, to work on "the greatest enigma".