Using theory to escape the descriptive impasse

Descriptive Set Theory Descriptive Set Theory

Introduction to Descriptive Set Theory

Mathematicians in the early 20th century discovered that the Axiom of Choice implied the existence of pathological subsets of the real line lacking desirable regularity properties (for example nonmeasurable sets). This gave rise to descriptive set theory, a systematic study of classes of sets where these pathologies can be avoided, including, in particular, the definable sets. In the first half...

The Agricultural Impasse.

Nitrogen Mustard Inactivation of the Cytoplasmic Factor Kappa, in Paramecium * aurelia, Variety 4: Robert P. Geckler ........ ......................... A New Method for the Study of Submicroscopic Spaces: Ch. A. Baud and M. J. Dallemagne ... Levels of Adaptation and Brightness Changes During Color Adaptation: Dorothea Jameson and Leo M. Hurvich .... Measurement of Ionizing. Radiations in Vivo: ...

The Descriptive Component Display Theory*

The Descriptive Component Display Theory describes explicitly the components of the instructional process; it dissects, identifies and summarizes learner performances; it likewise, dissects and synthesizes the subject matter content and matches content classification with learner performances. Possible presentation forms are also classified as are the modes with which these presentations can be...

The epidemiological impasse.

We read with interest the letter of QUANJER et al. [1] persuading the Global Initiative for Chronic Obstructive Lung Disease (GOLD) committee to abandon the fixed ratio of forced expiratory volume in 1 s (FEV1)/forced vital capacity (FVC) ,0.70 in favour of the lower limit of normal (LLN). We feel that, in the current debate, some basic epidemiological principles have been overlooked. We will b...