If f is a function from the
rational numbers in [0,1] to the complex plane and c is a complex sequence, then the
Hausdorff matrix H(c) for c and a sequence L(f,c) are defined:
Theorem. If f is a function from the rationals in [0,1] to the plane and L(f,c)
converges for each complex sequence c, then f is a subset (contraction) of a
polynomial.
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