3 ms·If you could name those older textbooks I'd be very grateful...by leoc 9y agoIf you could name those older textbooks I'd be very grateful...ethn 9y ago"Harmonic analysis in phase space" by Folland who illustrates the Fourier Transform with physical applications. "The Analytic Theory of Heat" Joseph Fourier who explains the realization at length.leoc 9y agoThanks!