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Keys, Nominate, and Concrete Domains

Many description logics (DLs) combine knowledge representation on an abstract, logical level with an interface to "concrete" domains such as numbers and strings. We propose to extend such DLs with key constraints that allow the expression of statements like "US citizens are uniquely identified by their social security number". Based on this idea, we introduce a number of natural description log...

Appreciating a Hiley Respected Colleague

One cannot sensibly introduce Basil Hiley’s work as a mathematical physicist without his collaboration with David Bohm, lasting from 1962, when Basil went to Birkbeck College, to Bohm’s death in 1992. The beginning of their careers shows an astonishing similarity in the study of collective phenomena—Bohm in plasmas, Basil in molecules. However, their topics changed drastically over time, and th...

Meehl as colleague.

The author summarizes some memories and impressions of Paul Meehl as graduate advisor, classroom teacher, and departmental colleague.

When a Surgical Colleague Makes an Error.

Professionalism requires that doctors acknowledge their errors and figure out how to avoid making similar ones in the future. Over the last few decades, doctors have gotten better at acknowledging mistakes and apologizing to patients when a mistake happens. Such disclosure is especially complicated when one becomes aware of an error made by a colleague. We present a case in which consultant sur...