Let $(B_t)_t$ be a brownian motion and: $$ X_t=\int_0^t B_u \, du. $$ What is the quadratic variation $<X>_t$ of $X$?
2026-02-23 04:56:26.1771822586
Quadratic variation of $X_t=\int_0^t B_u \, du$
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