The three discrete invariances - reflection invariance, charge conjugation invariance, and time reversal invariance - are connected by an important theorem called the CPT theorem.

Qinghua was first established as a preparatory school in 1911. In 1928, it became a university. In 1929, my father joined Qinghua as a professor, so that was also the year that I moved to that campus because my father brought the whole family along.

The application of group theory to physics became one of the main branches of physics that I specialized in.

Chen-Ning Yang Quotes