I start learning stochastic calculus and always come across this 2 notations $\ dW_t^2 , dt^2 $
Does $\ dW_t^2$ mean $\ d(W_t)^2 $ or $\ (dW_t)^2 $ ?
Similarly, does $\ dt^2$ means $\ d(t^2)$ or $\ (dt)^2$?
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