Eyewitnesses (n = 107) to a staged theft made identifications from a photo spread and then responded to 11 questions that measured their memory for peripheral details (e.g., how many pictures were in the room where the theft occurred?). Results indicated that witnesses who accurately identified the thief (n = 57) averaged fewer correct answers on the peripheral details test than did eyewitnesse...

Given a satisfiable 3-SAT formula, how hard is it to find an assignment to the variables that has Hamming distance at most n/2 to a satisfying assignment? More generally, consider any polynomial-time verifier for any NP-complete language. A d(n)-Hammingapproximation algorithm for the verifier is one that, given any member x of the language, outputs in polynomial time a string a with Hamming dis...

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