Consider approximation with respect to the Chebyshev norm $\|g\| = \sup \{ |g(x)|: 0 \leq x \leq 1\}$ on [0, 1]. A subset G of C[0, 1] such that each f ε C[0, 1] has a unique best approximation from G ...
The circuit in Figure 1 was given to me some while ago as a three-pole, active 1 dB Chebyshev lowpass filter. I never confirmed that its transfer function complied with the Chebyshev polynomial, but ...
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