Dirichlet hyperbola method

Also called Dirichlet's hyperbola method, divisor-pair symmetry method.

Evaluates the divisor summatory function in O(sqrt n) by counting lattice points under a hyperbola.

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Ladder	Level	What the next level needs
Human proof	H0 no proof	add a proof in proofs/ (06.5)
Lean	L0 no Lean part	name a Lean module in the lean field (07)
Visual	V0 none	add viz/scene.ts or a figure (10)
Writing	W0 stub	the section The problem pseudocode in The algorithm complexity claims in the front matter one source with a locator