Algorithmically determining whether a rational point is inside an open, constructive set or on the boundary of it is generally impossible

Authors

  • Jiajie Fang
  • Qisheng Ge
  • Peihong Li

DOI:

https://doi.org/10.61173/qxr5t711

Keywords:

Constructive Mathematics, Open Set, Ratio-nal Point, Unextendible Program

Abstract

We can determine whether this point is in the interior, boundary, or exterior of this set. In constructive mathematics, this is not always the case. The aim of this research is to demonstrate that it is generally impossible to algorithmically determine whether a point is in an open, constructive set or at its boundaries.

References

[1] Bishop, E. 1967. Foundations of constructive analysis, McGraw-Hill, New York

[2] Shanin N.A., “A hierarchy of ways of understanding judgments in constructive mathematics” Problems of the constructive direction in mathematics. Part 6, Trudy Mat. Inst. Steklov., 129, 1973,203–266; Proc. Steklov Inst. Math., 129(1973), 209–271

[3] Kushner, B.A. 1985, Lectures on Constructive Mathematical Analysis, Providence, RI: American Mathematical Society.

[4] A. M. Turing: On computable numbers, with an application to the Entscheidungsproblem, Proc. Lond. Math. Soc., ser. 2, 42 (1936), 230–265

[5] Shen, A., and Vereshchagin N.K. Computable Functions. AMS Press, 2003

[6] A. M. Turing: Corrections, Proc. Lond. Math. Soc., ser. 2, 43 (1937), 544–546

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Published

2025-07-06