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 Section 01)
- 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]
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