- the Charles River at Night

As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they are not reality.

- Albert Einstein

Newton's Mechanics

Schrodinger Equation

Heisenberg Uncertainty Principle (principle of indeterminacy) 

First Law of Thermodynamics: Conservation of Energy

Second Law of Thermodynamics:

Central Limit Theorem (CLT)

Kolmogorov Complexity

Shannon Theory of Communication

Galois Field (Finite Field Theory)

NP-Completeness