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Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 202 / 5 / a / 2

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2022 iii Paper 202 5 a
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For a partition π of [0,t], apply the first inequality to each increment of the covariation and then the Cauchy-Schwarz inequality:
∑π​∣Δ[M,N]∣≤∑π​Δ[M]Δ[N]​≤[M]t​[N]t​​.
(1)
Taking the supremum over partitions proves the Kunita-Watanabe inequality
Vt​([M,N])≤[M]t​[N]t​​.
(2)

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