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Context-Dependent Functions: Narrowing the Realm of Turing's Halting Problem
Logic in Computer Science · Submitted 13 Jan 2015
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim The conclusion of the proof of HP's undecidability is thus shown to be overly strong, as it doesn't show that no solution to HP exists, but rather that a solution must be a CDF.
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The abstract, sentence by sentence
This paper describes Turing's Halting Problem (HP), and reviews the classic proof that no function exists that can solve HP. The concept of a "Context-Dependent Function" (CDF), whose behavior varies based on seemingly irrelevant changes to a program calling that function, is introduced, and the proof of HP's undecidability is re-examined in light of CDFs. The existence of CDFs is established via a pair of examples of such functions. The conclusion of the proof of HP's undecidability is thus shown to be overly strong, as it doesn't show that no solution to HP exists, but rather that a solution must be a CDF. A higher-level analysis of this work is given, followed by conclusions and comments on future work.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | This paper describes Turing's Halting Problem (HP), and reviews the classic proof that no function exists that can solve HP. | background 1.00 | 0.37 | 0.02 | asserted 0.97 |
| s1 | The concept of a "Context-Dependent Function" (CDF), whose behavior varies based on seemingly irrelevant changes to a program calling that function, is introduced, and the proof of HP's undecidability is re-examined in light of CDFs. | contribution 0.99 | 0.84 | 0.08 | asserted 0.97 |
| s2 | The existence of CDFs is established via a pair of examples of such functions. | result 0.49 | 0.89 | 0.04 | asserted 1.00 |
| s3 | The conclusion of the proof of HP's undecidability is thus shown to be overly strong, as it doesn't show that no solution to HP exists, but rather that a solution must be a CDF. | interpretation 0.64 | 0.89 | 0.91 | asserted 1.00 |
| s4 | A higher-level analysis of this work is given, followed by conclusions and comments on future work. | future work 0.62 | 0.69 | 0.03 | asserted 0.61 |
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The paper
Original abstract
This paper describes Turing's Halting Problem (HP), and reviews the classic proof that no function exists that can solve HP. The concept of a "Context-Dependent Function" (CDF), whose behavior varies based on seemingly irrelevant changes to a program calling that function, is introduced, and the proof of HP's undecidability is re-examined in light of CDFs. The existence of CDFs is established via a pair of examples of such functions. The conclusion of the proof of HP's undecidability is thus shown to be overly strong, as it doesn't show that no solution to HP exists, but rather that a solution must be a CDF. A higher-level analysis of this work is given, followed by conclusions and comments on future work.
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