Cleo (mathematician)

Vladimir Reshetnikov (born 1979) is an Uzbekistani-American software developer and mathematician who became known for providing precise answers to complex mathematical integration problems without showing any intermediate steps under the pseudonym Cleo. Due to the extraordinary accuracy and speed of the provided solutions, it was debated online whether Cleo was an individual genius or a collective pseudonym system.

During the poster's active period, Cleo posted 39 answers to advanced mathematical questions, primarily focusing on complex integration problems that had stumped other users. Cleo's answers were characterized by being consistently correct while providing no explanation of methodology, often appearing within hours of the original posts. The account claimed to be limited in interaction due to an unspecified medical condition.

The mystery surrounding Cleo's identity and mathematical abilities generated interest within the mathematical community, and some users attempted to analyze solution patterns and writing style for clues. Some compared Cleo to historical mathematical figures like Srinivasa Ramanujan, who was known for providing solutions without conventional proofs. In January 2025, Cleo was revealed to be Vladimir Reshetnikov.