EntityQ2096184· pop 13· linked from 93 articlesPlancherel theoremSign in to savetheorem in harmonic analysisConnectionssquare-integrable functionEntityisometryEntityinner product spaceEntityLp spaceEntityHilbert–Schmidt operatorEntitymathematicsEntityPythagorean theoremEntitymathematical analysisEntitydigital object identifierEntityintegralEntityprobability theoryEntitynormal distributionEntityFourier transformEntityEuclidean spaceEntityHilbert spaceEntityfunctional analysisEntitysquareEntityRiemann hypothesisEntityabelian groupEntitynumber lineEntityCategoriesLp spacesTheorems in Fourier analysisTheorems in functional analysisTheorems in harmonic analysis