Main Page | See live article | Alphabetical index In mathematics, an identity is an equality that remains true regardless of the values of any variables that appear within it. Identities for classes of functions Logarithmic identities Exponential identities Trigonometric identities Hyperbolic function identities Hypergeometric function identities Combinatorial identities Named identities Bézout's identity Euler's identity This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.