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 be assigned at least one classification number from 01-XX)
• 31-04 Explicit machine computation and programs (not the theory of computation or programming)
• 31-06 Proceedings, conferences, collections, etc.
• 31Axx Two-dimensional theory
• 31Bxx Higher-dimensional theory
• 31Cxx Other generalizations
• 31D05 Axiomatic potential theory