Open Problem
Given a vector, is it possible to say if there exists random variables such that their joint entropies are given by ? It turns out that for the problem has been solved. But for, it still remains unsolved. Defining the set of all such vectors that can be constructed from a set of random variables as, we see that a complete characterization of this space remains an unsolved mystery.
Read more about this topic: Entropic Vector
Famous quotes containing the words open and/or problem:
“Meanwhile Snow White held court,
rolling her china-blue doll eyes open and shut
and sometimes referring to her mirror
as women do.”
—Anne Sexton (1928–1974)
“I don’t have any problem with a reporter or a news person who says the President is uninformed on this issue or that issue. I don’t think any of us would challenge that. I do have a problem with the singular focus on this, as if that’s the only standard by which we ought to judge a president. What we learned in the last administration was how little having an encyclopedic grasp of all the facts has to do with governing.”
—David R. Gergen (b. 1942)