Abstract: An infinite graph may have the property that two independent random walks on the graph  never meet each other, although each of them visits every vertex of the graph infinitely often.

Abstract: The inference of the interior properties of the Sun and Earth using surface measurements of the seismic wavefield are active areas.

Abstract: Lost sales inventory models with large lead times, which arise in many practical settings, are notoriously difficult to optimize due to the curse of dimensionality.

Abstract: We tend to think of communication in terms of the passing of information.  When we say something to someone, we change their knowledge state as well as their beliefs.