The Fundamental Theorem of Poker: Every time you play a hand differently from the way you would have played it if you could see all your opponents' cards, they gain; and every time you play your hand the same way you would have played it if you could see all their cards, they lose.

The Fundamental Theorem of Arithmetic states that every natural number greater than 1 can be written as a unique product of prime numbers.

The Fundamental Theorem of Algebra states that every non-constant single-variable polynomial with complex coefficients has at least one complex root.

The First Fundamental Theorem of Calculus: Let f be a continuous real-valued function defined on a closed interval [a, b]. Let F be the function defined, for all x in [a, b], by Then, F is continuous on [a, b], differentiable on the open interval (a, b), and for all x in (a, b).

The Second Fundamental Theorem of Calculus: Let f be a continuous real-valued function defined on a closed interval [a, b]. Let F be an antiderivative of f, that is one of the infinitely many functions such that, for all x in [a, b], Then .