An identity is a mathematical relationship equating one quantity to another (which may initially appear to be different).
Identity
See also
Abel's Differential Equation Identity, Andrews-Schur Identity, BAC-CAB Identity, Beauzamy and Dégot's Identity, Beltrami Identity, Bianchi Identities, Bochner Identity, Brahmagupta Identity, Cassini's Identity, Christoffel-Darboux Identity, Chu-Vandermonde Identity, de Moivre's Identity, Dougall-Ramanujan Identity, Euler Four-Square Identity, Euler Identity, Ferrari's Identity, Fibonacci Identity, Frobenius Triangle Identities, Green's Identities, Hypergeometric Identity, Identity Graph, Jackson's Identity, Jacobi Identities, Jacobi's Determinant Identity, Jordan Identity, Lagrange's Identity, Leibniz Identity, Liouville Polynomial Identity, Morgado Identity, Quintuple Product Identity, Ramanujan 6-10-8 Identity, Ramanujan Cos/Cosh Identity, Ramanujan's Identity, Ramanujan's Sum Identity, Reznick's Identity, Rogers-Ramanujan Identities, Schaar's Identity, Strehl Identities, Sylvester's Determinant Identity, Trinomial Identity, Visible Point Vector Identity, Worpitzky's IdentityExplore with Wolfram|Alpha
References
Petkovšek, M.; Wilf, H. S.; and Zeilberger, D. "Identities." §2.2 in A=B. Wellesley, MA: A K Peters, pp. 21-22, 1996. http://www.cis.upenn.edu/~wilf/AeqB.html.Referenced on Wolfram|Alpha
IdentityCite this as:
Weisstein, Eric W. "Identity." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Identity.html