However in 1968, Riazuddin returned to Pakistan on the request of Abdus Salam, and joined Quaid-i-Azam University's Institute of Physics where he engaged the research on string theory, theory of relativity, particle physics and nuclear physics.
Riazuddin returned to Pakistan on the request of Abdus Salam. This was however in 1968. Riazuddin joined Quaid-i-Azam University's Institute of Physics. This was however in 1968. He engaged the research on string theory. String theory was theory of relativity. String theory was theory of particle physics. String theory was theory of nuclear physics.