Problem 975: The medium-modulus gap in divisor pairing

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divisor_pairing_range: The direct quadratic divisor-pairing estimate loses control in degree at least three because individual root-progression errors extend to moduli of order X to the degree over two.

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The [[research/erdos_975/divisor_pairing_range|argument on the medium-modulus gap in divisor pairing]] records its exact scope, source premises, and remaining gap toward Problem 975.