**Modern**

**Chen's theorem**: Chen's theorem states that every sufficiently large even number can be written as the sum of either two primes, or a prime and a semiprime, and was first proven by Chen Jingrun in 1966, with further details of the proof in 1973.**Cheng's eigenvalue comparison theorem**: Cheng's theorem was introduced in 1975 by Hong Kong mathematician Shiu-Yuen Cheng. It states in general terms that when a domain is large, the first Dirichlet eigenvalue of its Laplace–Beltrami operator is small. This general characterization is not precise, in part because the notion of "size" of the domain must also account for its curvature.**Chern class**: Chern classes are characteristic classes in mathematics first introduced by Shiing-Shen Chern in 1946.**Culturing Chlamydia trachomatis bacteria**: Chlamydia trachomatis agent was first cultured in the yolk sacs of eggs by Chinese scientists in 1957**Heterosis in rice, three-line hybrid rice system**: A team of agricultural scientists headed by Yuan Longping applied heterosis to rice, developing the three-line hybrid rice system in 1973. The innovation allowed for roughly 12,000 kg (26,450 lbs) of rice to be grown per hectare (10,000 m2). Hybrid rice has proven to be greatly beneficial in areas where there is little arable land, and has been adopted by several Asian and African countries. Yuan won the 2004 Wolf Prize in agriculture for his work.**Huang-Minglon modification**: The Huang-Minglon modification, introduced by Chinese chemist Huang Minglon, is a modification of the Wolff–Kishner reduction and involves heating the carbonyl compound, potassium hydroxide, and hydrazine hydrate together in ethylene glycol in a one-pot reaction.**Feathered theropods**: The first feathered dinosaur outside of Avialae,*Sinosauropteryx*, meaning "Chinese reptilian wing," was discovered in the Yixian Formation by Chinese paleontologists in 1996. The discovery is seen as evidence that dinosaurs originated from birds, a theory proposed and supported decades earlier by paleontologists like Gerhard Heilmann and John Ostrom, but "no true dinosaur had been found exhibiting down or feathers until the Chinese specimen came to light." The dinosaur was covered in what are dubbed 'protofeathers' and considered to be homologous with the more advanced feathers of birds, although some scientists disagree with this assessment.**Lee–Yang theorem**: The Lee-Yang theorem in statistical mechanics was first proved for the Ising model by future Nobel laureates Tsung-Dao Lee and Chen Ning Yang in 1952. The theorem states that if partition functions of certain models in statistical field theory with ferromagnetic interactions are considered as functions of an external field, then all zeros are purely imaginary, or on the unit circle after a change of variable.**Tsen rank**: A Tsen rank of a field describes conditions under which a system of polynomial equations must have a solution in the field. It was introduced by mathematician Chiungtze C. Tsen in 1936.**Wu's method**: Wu's method was discovered in 1978 by Chinese mathematician Wen-Tsun Wu. The method is an algorithm for solving multivariate polynomial equations, based on the mathematical concept of characteristic set introduced in the late 1940s by J.F. Ritt.

Read more about this topic: List Of Chinese Discoveries, Discoveries

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