Martin Baxter and Andrew Rennie, Financial Calculus (Cambridge, U.K.: Cambridge University Press, 2000), p. 65: "We could suppress those paths which had path probability zero, but now we have lost something. Those paths may have been P-impossible but they are Q-possible. If we throw them away, then we have lost information about Q just where it is relevant -- paths which are Q-possible."
But are they Kim possible?!
:'(
UPDATE: I should mention that I killed a ladybug with this book. As an instrument of death, it is slender and elegant, the .22-caliber pistol of quantitative-finance literary insecticides.
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