Chen-Ning Frank Yang, also known as Yang Zhenning (born October 1, 1922), is a Chinese physicist who works on statistical mechanics and particle physics. He and Tsung-dao Lee received the 1957 Nobel Prize in Physics for their work on parity nonconservation of weak interaction. The two proved theoretically that one of the basic quantum-mechanics laws, the conservation of parity, is violated in the so-called weak nuclear reactions, those nuclear processes that result in the emission of beta or alpha particles. The most important work of Yang is Yang-Mills theory. Tsung-Dao Lee (born November 24, 1926) is a Chinese-American physicist, known for his work on parity violation, the Lee Model, particle physics, relativistic heavy ion (RHIC) physics, nontopological solitons and soliton stars. He holds the rank of University Professor Emeritus at Columbia University, where he has taught since 1953 and from which he retired in 2012. Includes signed first page of their study, along with Chinese newspaper articles.|||Length: 10 in (25.4 cm) Width: 6 1/2 in (16.5 cm)|諾貝爾物理獎得主楊振寧、李政道 簽名|