> 31-XX Potential theory

31-00 General reference works (handbooks, dictionaries, bibliographies, etc.)	31-01 Instructional exposition (textbooks, tutorial papers, etc.)	31-02 Research exposition (monographs, survey articles)
31-03 Historical (must also be assigned at least one classification number from Section 01)	31-04 Explicit machine computation and programs (not the theory of computation or programming)	31-06 Proceedings, conferences, collections, etc.
31-99 Potential theory (not classified at a more specific level)	31AXX Two-dimensional theory	31BXX Higher-dimensional theory
31CXX Other generalizations	31D05 Axiomatic potential theory

31-XX Potential theory