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:
“The republican is the only form of government which is not eternally at open or secret war with the rights of mankind.”
—Thomas Jefferson (1743–1826)
“To make a good salad is to be a brilliant diplomatist—the problem is entirely the same in both cases. To know exactly how much oil one must put with one’s vinegar.”
—Oscar Wilde (1854–1900)