Definition: Given a set of pairs of strings, find a sequence of pairs such that the concatenation of all first members of the pairs is the same string as the concatenation of all second members. This is an undecidable problem.
Also known as PCP.
Emil Post, A Variant of a Recursively Unsolvable Problem. Bulletin of the American Mathematical Society, 52:264-268, 1946.
If you have suggestions, corrections, or comments, please get in touch with Paul E. Black.
Entry modified 14 April 2009.
HTML page formatted Tue Dec 6 16:16:32 2011.
Cite this as:
Sandeep Kumar Shukla, "Post's correspondence problem", in Dictionary of Algorithms and Data Structures [online], Paul E. Black, ed., U.S. National Institute of Standards and Technology. 14 April 2009. (accessed TODAY) Available from: http://www.nist.gov/dads/HTML/postsCorrespondProb.html