Post correspondence problem
Post correspondence problem
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What Wikipedia says
The Post correspondence problem is an undecidable decision problem that was introduced by Emil Post in 1946. Because it is simpler than the halting problem and the Entscheidungsproblem it is often used in proofs of undecidability.
Excerpt from the Wikipedia article “Post correspondence problem”, under the CC BY-SA 4.0 license. Read the article on Wikipedia
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