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Locally phi-integrable sigma-martingale densities for general semimartingales

Choulli, Tahir; Schweizer, Martin - 2015 - This version: 22.5.2015

A P-sigma-martingale density for a given stochastic process S is a local P-martingale Z0 starting at 1 such that the product ZS is a P-sigma-martingale. Existence of a P-sigma-martingale density is equivalent to a classic absence-of-arbitrage property of S, and it is invariant if we replace the...

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