3 Examine The Proof Of Bessel S Inequality And Show That Equality Holds If The Fouri 1386192
3. Examine the proof of Bessel’s inequality and show that equality holds if the Fourier series of ϕ converges to ϕ uniformly. This is known as Parseval’s equality. Apply Par- seval’s equality to the Fourier series in Example 6.4.3 to derive the summation identity ∞ 1 π4 n=1 n4 = 90 . […]


