'''Mathematical entropy''' is a formulation of [[entropy]] for mathematical purposes, particularly in geometry. A definition of entropy by Perelman, for example, led to his solution of one of the greatest unsolved problems of the 20th century, the Poincare conjecture. | '''Mathematical entropy''' is a formulation of [[entropy]] for mathematical purposes, particularly in geometry. A definition of entropy by Perelman, for example, led to his solution of one of the greatest unsolved problems of the 20th century, the Poincare conjecture. |