Parseval's theorem

E624505

Parseval's theorem is a fundamental result in Fourier analysis that equates the total energy of a function in the time (or spatial) domain with the total energy of its representation in the frequency domain.

All labels observed (4)

Label Occurrences
Parseval theorem 4
Fourier transform is an isometry on L2 1
Parseval identity 1

How this entity was disambiguated

Statements (45)

Predicate Object
instanceOf mathematical theorem
result in Fourier analysis
appliesTo L2(-π,π)
L2(R)
square-integrable functions
assumes existence of Fourier representation
square-integrability of the function
category theorems in functional analysis
theorems in harmonic analysis
theorems in real analysis
coreIdea conservation of L2 norm under Fourier transform
equality of energy in time and frequency domains
field Fourier analysis
applied mathematics
functional analysis
harmonic analysis
signal processing
generalizedBy Plancherel's theorem
historicalPeriod 19th century mathematics
holdsIn Hilbert spaces with orthonormal basis
implies Fourier transform is an isometry on L2
linked to: Parseval's theorem
isSpecialCaseOf Plancherel's theorem
mathematicalFormulation integral of |f(x)|^2 equals integral of |F(ω)|^2 up to normalization
sum of squares of Fourier coefficients equals L2 norm squared of function
namedAfter Marc-Antoine Parseval
relatedTo Bessel's inequality
linked to: Bessel inequality

orthogonality of trigonometric system
unitary operators
relatesConcept Fourier series
Fourier transform
L2 space
energy of a function
frequency domain
orthonormal basis
time domain
usedFor computing mean-square error in approximations
energy conservation checks in numerical algorithms
proving convergence properties of Fourier series
usedIn communications engineering
filter design
image processing
quantum mechanics
signal energy computation
spectral analysis
vibration analysis

How these facts were elicited

Referenced by (7)

Full triples — surface form annotated when it differs from this entity's canonical label.

Wiener–Khinchin theorem relatedTo Parseval's theorem
Cauchy–Schwarz inequality relatedTo Parseval theorem
linked to: Parseval's theorem
Riesz–Fischer theorem relatedTo Parseval theorem
linked to: Parseval's theorem
Fourier transform property Parseval theorem
linked to: Parseval's theorem
Parseval's theorem implies Fourier transform is an isometry on L2
linked to: Parseval's theorem
Bessel inequality relatedTo Parseval theorem
linked to: Parseval's theorem
Plancherel theorem for locally compact abelian groups relatedTo Parseval identity
linked to: Parseval's theorem