Exchange

Exchange rings, exchange equations, and lifting properties

Gift Exchange versus Monetary Exchange: Experimental Evidence

This paper reports findings from an experiment that implements the Lagos-Wright (2005) model of monetary exchange. We find that subjects generally avoid the autarkic equilibrium of that model and make trading decisions consistent with the model’s monetary equilibrium. Aliprantis, Camera and Puzzello (ACP, 2007) show that providing periodic access to centralized markets as in the Lagos and Wrigh...

Exchange lemmas 2 : General Exchange Lemma ✩

Exchange lemmas are used in geometric singular perturbation theory to track flows near normally hyperbolic invariant manifolds. We prove a General Exchange Lemma, and show that it implies versions of existing exchange lemmas for rectifiable slow flows and loss-of-stability turning points. © 2007 Elsevier Inc. All rights reserved. MSC: 34E15; 34C30

Countable Exchange and Full Exchange Rings

We show that a Dedekind-finite, semi-π-regular ring with a “nice” topology is an א0-exchange ring, and the same holds true for a strongly clean ring with a “nice” topology. We generalize the argument to show that a Dedekind-finite, semi-regular ring with a “nice” topology is a full exchange ring. Putting these results in the language of modules, we show that a cohopfian module with finite excha...

Exchange-Repairs: Managing Inconsistency in Data Exchange

In a data exchange setting with target constraints, it is often the case that a given source instance has no solutions. Intuitively, this happens when data sources contain inconsistent or conflicting information that is exposed by the target constraints at hand. In such cases, the semantics of target queries trivialize, because the certain answers of every target query over the given source ins...