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Click to increase image sizeClick to decrease image size *Here and in what follows f≈g indicates that the differencef—g is bounded, while f∼g indicates that the ratio f:g approaches one Notes *Here and in what follows f≈g indicates that the differencef—g is bounded, while f∼g indicates that the ratio f:g approaches one
A. N. Kolmogorov (Mon,) studied this question.