syllogizer

/ˈsɪləˌdʒaɪzər/
noun
  1. A person who uses formal logical reasoning, especially in the form of a syllogism (a logical argument with two premises and a conclusion).
    • The debate club's best syllogizer won the tournament by constructing airtight arguments.
    • The philosopher was a skilled syllogizer, breaking down complex arguments into simple steps.
    • As a syllogizer, she could spot flaws in reasoning that others missed.