On the closure in the Emery topology of semimartingale wealth-process sets
Abstract
A wealth-process set is abstractly defined to consist of nonnegative c\`adl\`ag processes containing a strictly positive semimartingale and satisfying an intuitive re-balancing property. Under the condition of absence of arbitrage of the first kind, it is established that all wealth processes are semimartingales and that the closure of the wealth-process set in the Emery topology contains all "optimal" wealth processes.
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