Our Hostile Friend

A Tribute to Our Friend

The American Dental Hygienists' Association (ADHA) central office staff is made up of highly competent individuals who work together for the benefit of our profession. Sometimes it seems as though people take positions with ADHA and stay only long enough to gain experience and build a reputation before moving on to better paying positions somewhere else. This can't be prevented and is an expect...

To our mentor and friend, professor Solé-Balcells.

Glossing the career of Dr. Francesc-Xavier Solé-Balcells is not easy, but I will try to do it from the point of view of the quality that he has always shown in any of his contributions in over 60 years of practice of urology. He started in urology as a resident of Professor Antonio Puigvert in Spain which was very different from Spain now. He quickly became known for his scientific rigor, his c...

Our Best Friend, the Coma Cluster (a Historical Review)

In this paper I describe how our knowledge and understanding of the properties and structure of the Coma cluster of galaxies has evolved through the years, since early this century, when the first maps of the density of nebulæ in the Coma region were produced, and until the present time. It is shown that most of the recent discoveries that have led to a change in our view of this cluster, were ...

Countering Hostile Forensic Techniques

SPLIT STRUCTURES To our friend Aurelio Carboni for his 60 th birthday

In the early 1990’s the authors proved that the full subcategory of ‘suplattices’ determined by the constructively completely distributive (CCD) lattices is equivalent to the idempotent splitting completion of the bicategory of sets and relations. Having many corollaries, this was an extremely useful result. Moreover, as the authors soon suspected, it specializes a much more general result. Let...