This is pretty important in mathematical finance, where one moves from a real-world measure to a risk-neutral measure to make computations feasible. https://en

This is pretty important in mathematical finance, where one moves from a real-world measure to a risk-neutral measure to make computations feasible. https://en.wikipedia.org/wiki/Girsanov_theorem https://en.wikipedia.org/wiki/Girsanov_theorem https://en.wikipedia.org/wiki/Risk-neutral_measure https://en.wikipedia.org/wiki/Risk-neutral_measure