The simplest type of integral extension of a unique factorization domain B is obtained by adjoining to B an n-th root of one of its elements; that is, by forming the ring Bn = B[z]=(z n g), where n 2 Z and g 2 B. When n = 1, Bn = B. When n 2 it is natural to ask for what g 2 B will unique factorization be preserved? The case where B is a polynomial ring over an algebraically closed eld k immedi...

A heat pump is an electrically-ponered refrigerationcycle device which is capable ofproviding both heating and cooling to a residence. In the sumrrcr, it operates like an air conditioner by "moving" heat from inside the house to the outside. In the winter, the refrigerant flow is reversed, "moving" heat into the house by further chilling the already cold outside air and transferring the heat ga...

The definition of pregnancy as the state of a female in the time interval between fertilization of her ova and the expulsion of the foetuses at term, lays focus on the maternal organism and casual thinking tends to emphasize maternal physiology and welfare. In part, this is due to the fact that the maternal organism is reasonably accessible for day to day observations and measurements which do ...

Grover et al (1994) have provided an excellent and thought provoking analysis of the usefulness of yoga in treating neurotic disorders. Some questions however remain. One criticism of psychotherapy is that the criteria for the selection of suitable candidates usually identify patients with good prognostic features-patients who may improve even without any therapeutic intervention. Another criti...