39-00 General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to difference and functional equations 24
39-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to difference and functional equations 102
39-02 Research exposition (monographs, survey articles) pertaining to difference and functional equations 172
39-03 History of difference and functional equations [Consider also classification numbers from Section 01-XX] 58
39-06 Proceedings, conferences, collections, etc. pertaining to difference and functional equations 243
39Axx Difference equations {For dynamic equations on time scales, see 34N05; for dynamical systems, see 37-XX} 20782
39B62 Functional inequalities, including subadditivity, convexity, etc. [See also 26A51, 26B25, 26Dxx] 1326
39B82 Stability, separation, extension, and related topics for functional equations [See also 46A22] 2908