The answer is Aristotle.
Aristotle was born in 384 BCE and died in 322 . He was one of the main Greek philosophers , whose contributions have been used up to the present.
His area of knowledge was unlimited. He was involved in all sciences and arts. He also was responsible for founding formal logic.
Aristotle developed a theory called syllogism and a formal system for reasoning.He believed that a conclusion is true only if the premises of a given statement are true.
