Historically, the source of Fourier series. Also includes a good deal of Lie group theory and quantum group theory, theory of distributions and topics from Functional analysis, Yang-Mills problems, Feynman diagrams, and so on. Statistical mechanics, structure of matter is the study of large-scale systems of particles, including stochastic systems and moving or evolving systems. Specific types of matter studied include fluids, crystals, metals, and other solids. Biology and other natural sciences whose connections merit explicit connection in the MSC scheme include Chemistry, Biology, Genetics, and Medicine, In chemistry and biochemistry, it is clear that graph theory, differential geometry, and differential equations play a role.
Medical technology uses techniques of information transfer and visualization.
Observe that the branches of mathematics most closely allied with the fields of mathematical physics are the parts of analysis , particularly those parts related to differential equations . The other sciences draw on these as well as probability and statistics and, increasingly, numerical methods. In addition to the resources mentioned on the index pages for these individual disciplines, one might summarize here the many resources which apply to mathematical physics generally. You might want to continue the tour with a trip through the remaining subject areas of mathematics.