Pseudoanalytic function

In mathematics, pseudoanalytic functions are functions introduced by Lipman Bers (1950, 1951, 1953, 1956) that generalize analytic functions and satisfy a weakened form of the Cauchy–Riemann equations.

Definitions

Let and let be a real-valued function defined in a bounded domain . If and and are Hölder continuous, then is admissible in . Further, given a Riemann Surface , if is admissible for some neighborhood at each point of , is admissible on .

The complex-valued function is pseudoanalytic with respect to an admissible at the point if all partial derivatives of and exist and satisfy the following conditions:

If is pseudoanalytic at every point in some domain, then it is pseudoanalytic in that domain.[1]

Similarities to analytic functions

  • If is not the constant , then the zeroes of are all isolated.
  • Therefore, any analytic continuation of is unique.[2]

Examples

  • Complex constants are pseudoanalytic.
  • Any linear combination with real coefficients of pseudoanalytic functions is pseudoanalytic.[1]

See also

References

  1. Bers, Lipman (1950), "Partial differential equations and generalized analytic functions" (PDF), Proceedings of the National Academy of Sciences of the United States of America, 36 (2): 130–136, doi:10.1073/pnas.36.2.130, ISSN 0027-8424, JSTOR 88348, MR 0036852, PMC 1063147, PMID 16588958
  2. Bers, Lipman (1956), "An outline of the theory of pseudoanalytic functions" (PDF), Bulletin of the American Mathematical Society, 62 (4): 291–331, doi:10.1090/s0002-9904-1956-10037-2, ISSN 0002-9904, MR 0081936

Further reading

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