39-XX Finite differences and functional equations

• 39-00 General reference works (handbooks, dictionaries, bibliographies, etc.)
• 39-01 Instructional exposition (textbooks, tutorial papers, etc.)
• 39-02 Research exposition (monographs, survey articles)
• 39-03 Historical (must be assigned at least one classification number from 01-XX)
• 39-04 Explicit machine computation and programs (not the theory of computation or programming)
• 39-06 Proceedings, conferences, collections, etc.
• 39Axx Difference equations, {For dynamical systems, see 58Fxx}
• 39Bxx Functional equations, see also {30D05}