Parseval's identity
for a orthonormal basis x1, x2, …, xn of a finite-dimensional inner product space X and x∈X. This is a generalization of Pythagoras' Theorem. The identity holds for an orthonormal sequence in an infinite-dimensional Hilbert space if and only if the sequence is complete, or equivalently, a Schauder basis. Compare Bessel's inequality.
- negation
- negative
- negative binomial distribution
- negative correlation
- negative direction
- negative number
- neighbourhood
- neighbourhood
- nested multiplication
- nested sets
- net
- net
- net
- network
- network flow
- Neumann condition
- Neumann, John Von
- neural nets
- neutral element
- neutral geometry
- newton
- Newton, Isaac
- Newton quotient
- Newton's identities
- Newton's interpolating polynomial