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4.5 Computer quiz
 For an efficient FFT, the size of the arrays to be transformed must be
 a multiple of 2
 a power of 2
 a prime number
 The linear solution computed for the advectiondiffusion equation
 converges linearly to the physical value
 converges quadratically to the physical value
 converges faster than any polynomial to the physical value
 is exact
 Compared with Fourier schemes, aliases in finite differences are
 never a problem (they do not exist)
 rarely a problem (short wavelengths numerically damped by spatial operators)
 as much a problem
 Compared with Burger's, the KortewegDeVries equation is
 less sensitive to aliasing
 equally sensitive to aliasing
 more sensitive to aliasing
