### 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}

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