Kolmogorov axioms or probability axioms were introduced by Soviet mathematician Andrey Kolmogorov(April 25, 1903- October 20, 1987).
All the theorems in probability theory are derived from the axioms.
1. For any element A of σ-algebra F, P(A) ≧ 0.
2. P(S) = 1.
3. If of σ-algebra F are pairwise disjoint, .