Discover how command and mixed economies differ, focusing on government control vs. private sector influence, supply and demand, and economic growth strategies.

Those who have some contact with President Maria tell me that she was thunderstruck and deeply upset by the outcome of her interview the day before yesterday. As usual, Karystianou did not examine ...

Introduction Maternal and child mortality has markedly decreased worldwide over the past few decades. Despite this success, the decline remains unequal across countries and is overall insufficient to ...

Abstract: In addressing the three-station time difference of arrival localization problem for terrestrial and sea surface targets, this study exploits the correspondence between z in the geodetic ...

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Abstract: With the multimedia sensor is widely used, moving objects detection and tracking based on video have gradually become a popular research field in multimedia sensor networks. For the ...

The original version of this story appeared in Quanta Magazine. All of modern mathematics is built on the foundation of set theory, the study of how to organize abstract collections of objects. But in ...