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https://doi.org/10.1080/17442509008833613

has been cited by the following article:

• TITLE: Martingales and Super-Martingales Relative to a Convex Set of Equivalent Measures

  AUTHORS: Nicholas S. Gonchar

  KEYWORDS: Random Process, Convex Set of Equivalent Measures, Optional Doob Decomposition, Local Regular Super-Martingale, Martingale, Fair Price of Contingent Claim

  JOURNAL NAME: Advances in Pure Mathematics, Vol.8 No.4, April 24, 2018

  ABSTRACT: In the paper, the martingales and super-martingales relative to a convex set of equivalent measures are systematically studied. The notion of local regular super-martingale relative to a convex set of equivalent measures is introduced and the necessary and sufficient conditions of the local regularity of it in the discrete case are founded. The description of all local regular super-martingales relative to a convex set of equivalent measures is presented. The notion of the complete set of equivalent measures is introduced. We prove that every bounded in some sense super-martingale relative to the complete set of equivalent measures is local regular. A new definition of the fair price of contingent claim in an incomplete market is given and the formula for the fair price of Standard Option of European type is found. The proved Theorems are the generalization of the famous Doob decomposition for super-martingale onto the case of super-martingales relative to a convex set of equivalent measures.