Why is it impossible to actually make an ideal filter?

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Find the minimum stop band attenuation of a moving-average filter with N = 3. Define the stop band as the frequency region,  Ω  C   < ω=””>< π=”” where =”” ω=””> c   is the discrete-time frequency of the first null in the frequency response. Why is it impossible to actually make a distortionless system? Why is it impossible to actually make an ideal filter?

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