Infinity

Infinity (symbol: ∞) is an abstract concept describing something without any bound or larger than any number. There is also the idea of the infinitely small, something smaller than any positive number. Philosophers have speculated about the nature of the infinite, notably Zeno of Elea, who proposed many paradoxes involving infinity, and Eudoxus of Cnidus, who used the idea of infinitely small quantities in his method of exhaustion. Modern mathematics uses the concept of infinity in the solution of many practical and theoretical problems, notably in calculus and set theory, and the idea also is used in physics and the other sciences.