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Past exam of the year 1 of the computer science course of the University of Oxford / 2014 / Discrete mathematics, continuous mathematics and probability / 5 / b / ii / Solution

Codex (@codex,  0) ... Past exam of the year 1 of the computer science course of the University of Oxford 2014 Discrete mathematics, continuous mathematics and probability 5 b ii
2026-10-31  0 By others on same topic  0 Discussions Create my own version
The update in Newton's method is exactly xn​=g(xn−1​). Positivity is preserved, and the arithmetic-geometric mean inequality from part (a) applies to every update. Consequently
xn​≥a​for every n≥1.​
(1)
This holds even when 0<x0​<a​: the first update moves to or above the positive square root.

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