44 (1940-now) Integral transforms, operational calculus [For fractional derivatives and integrals, see 26A33. For Fourier transforms, see 42A38, 42B10. For integral transforms in distribution spaces, see 46F12. For numerical methods, see 65R10]

44-00 (1973-now) General reference works (handbooks, dictionaries, bibliographies, etc.)

44-01 (1973-now) Instructional exposition (textbooks, tutorial papers, etc.)

44-02 (1973-now) Research exposition (monographs, survey articles)

44-03 (1973-now) Historical (must also be assigned at least one classification number from Section 01)

44-04 (1980-now) Explicit machine computation and programs (not the theory of computation or programming)

44-06 (1973-now) Proceedings, conferences, collections, etc.

44A (1973-now) Integral transforms, operational calculus [For fractional derivatives and integrals, see 26A33. For Fourier transforms, see 42A38, 42B10. For integral transforms in distribution spaces, see 46F12. For numerical methods, see 65R10]

44.00 (1959-1972) General

44.0 (1940-1958) Integral transforms, operational calculus

44.10 (1959-1972) Laplace transform

44.25 (1959-1972) Convolution

44.28 (1959-1972) General transforms

44.30 (1959-1972) Special transforms. Legendre, Hilbert, etc. [See also 45.33]

44.32 (1959-1972) Multiple transforms

44.33 (1959-1972) Transforms of special functions

44.40 (1959-1972) Operational calculus

44.42 (1959-1972) Operational calculus in several variables

44.50 (1959-1972) Fractional integrals [See also 26.43]

44.60 (1959-1972) Moment problems [See also 42.27]

44.99 (1959-1972) None of the above, but in this section