• Each table in the database has one column and stores the possible values for a ground fluent term. •Whenever there is complete knowledge about the term, the corresponding table has exactly one row. E.g., the ground fluent term door has only one possible value (Closed ) and so the table for door has exactly one row: Closed. •Whenever there is incomplete knowledge, the table has more than one r...

paper, we attempt to reconstruct the sitcalculus on a dense flow of time. The

本文概述维谢格拉德四国集团国家，即捷克共和国、波兰、匈牙利和斯洛伐克当前的经济形势。就人口和领土而言，这四个国家约占欧盟的九分之一，而经济产出占二十分之一。在加入欧盟后，这些曾经属于前社会主义集团的国家继续紧密合作，形成集团。维谢格拉德四国集团（V4）国家是前社会主义国家当中最发达的。自入盟以来，逐渐赶上或超过一些早期入盟的国家，如葡萄牙和希腊，但还没有成功达到欧盟的平均水平。V4国家在疫情爆发后能继续增长，但俄乌战争是一个重大风险因素。

We utilize the situation calculus to develop a logical model of hypertext systems. The work builds upon the earlier work of Bieber and Kimbrough in the logical modeling of hypertext systems. In our presentation, a particular version of the situation calculus (which includes a language for programming complex actions) developed for the modeling of dynamic worlds and for the control of robotic ag...