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Paper   IPM / M / 16022
School of Mathematics
  Title:   Tanaka's theorem revisited
  Author(s):  Saeideh Bahrami
  Status:   To Appear
  Journal: Arch. Math. Logic
  Supported by:  IPM
Tanaka (1997) proved a powerful generalization of Friedman’s selfembedding theorem that states that given a countable nonstandard model (M;A) of the subsystem WKL0 of second order arithmetic, and any element m of M, there is a self-embedding j of (M;A) onto a proper initial segment of itself such that j fixes every predecessor of m.

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