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