Chen Ning Yang

Chen Ning Yang, byname Frank Yang is a Chinese theoretical physicist whose research with Tsung-Dao Lee showed that parity—the symmetry between physical phenomena occurring in right-handed and left-handed coordinate systems—is violated when certain elementary particles decay. Until this discovery it had been assumed by physicists that parity symmetry is as universal a law as the conservation of energy or electric charge.

In the year 1957, Yang was awarded the Nobel Prize in physics along with Tsung-Dao Lee "for their penetrating investigation of the so-called parity laws which has led to important discoveries regarding the elementary particles".

Yang’s father, Yang Ko-chuen (also known as Yang Wu-chih), was a professor of mathematics at Tsinghua University, near Peking. While still young, Yang read the autobiography of Benjamin Franklin and adopted “Franklin” as his first name. After graduation from the Southwest Associated University, in K’unming, he took his B.Sc. in 1942 and his M.S. in 1944. On a fellowship, he studied in the United States, enrolling at the University of Chicago in 1946. He took his Ph.D. in nuclear physics with Edward Teller and then remained in Chicago for a year as an assistant to Enrico Fermi, the physicist who was probably the most influential in Yang’s scientific development. Lee had also come to Chicago on a fellowship, and the two men began the collaboration that led eventually to their Nobel Prize work on parity. In 1949 Yang went to the Institute for Advanced Study in Princeton, New Jersey, and became a professor there in 1955. He became a U.S. citizen in 1964.

Yang is known for, amoung other things:

Landau–Yang theorem

Parity violation

Yang–Mills theory

Yang–Baxter equation

Byers-Yang theorem