Home > Science > Mathematics > Combinatorics > Graph Theory > Open Problems
Problems These are problems which have been on my homepage and are now put out to grass. See also permutation group problems. 1. In 1956, Rudin defined a permutation of the integers which maps 3x to 2x, 3x+1 to 4x+1, and 3x-1 to 4x-1 for all x. Problem: Determine the cycle structure of this permutation. I have just learned (December 1998) that this problem is older: it is the original Collatz ...
www.maths.qmw.ac.uk/~pjc/oldprob.html
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