The optimization of a randomness extractor can be best determined from the “min” variant of this variable as the smallest of the Rényi family variants of this variable. (15[1])For a uniform probability (15[1])distribution the Hartley function is equivalent to one definition of this variable. (15[1])A quantum type of this variable vanishes when the density matrix is that of a pure state and is named for (*) Von Neumann. (10[3])The molecular chaos assumption was used to derive an integral equal to a function of this variable, which following later convention was represented with an H. Gibbs created a definition of this variable (10[1])based on a summation of a function (10[1])of the probability of microstate energies. (10[1])For 10 points, name this variable equal to the Boltzmann constant times the natural log of microstates. ■END■