39-XX DIFFERENCE 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 also 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.
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39Axx Difference equations (For dynamical systems, see 37-XX, for dynamic equations on time scales, see 34N05)
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- 39Bxx Functional equations and inequalities [See also 30D05]