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3636Why Smooth Drift Terms Disappear from Quadratic VariationWhy do smooth finite-variation terms fail to contribute to quadratic variation even though they can dominate the path in level?随机过程中等essay未尝试面试订阅3637Why Independent Brownian Motions Have Zero CovariationWhy does independence of Brownian drivers force the covariation term to vanish?随机过程中等essay未尝试面试订阅3638Why Quadratic Variation Scales with the Square of a CoefficientWhy does multiplying a Brownian-driven process by c multiply its quadratic variation by c 2 rather than by c?随机过程中等essay未尝试面试订阅3639Why Quadratic Variation Identifies Diffusion StrengthWhy is quadratic variation often the cleanest object for reading off the local diffusion strength of a process?随机过程中等essay未尝试面试订阅3640Why a Time Change Alters Quadratic VariationWhy does replacing W t by W ct change quadratic variation even before any extra scaling coefficient is added?随机过程中等essay未尝试面试订阅