In Mumford’s Dispositions, the reader will find an extended treatment of the recent debate about dispositions from Ryle and Geach to the present. Along the way, Mumford presents his own views on several key points, though we found the book much more thorough in its assessment of opposing views than in the development of a positive account. As we’ll try to make clear, some of the ideas endorsed ...

The term CW-complex comes from “closure-finite with the weak topology”, where “closure-finite” refers to A3 and “weak topology” refers to A4. A finite complex is a CW-complex with only finitely many cells. Observe that if X is a finite complex, A4 is redundant, since W is the union of the compact sets φα((φ n α) −1W ), and these are closed since X is Hausdorff. If X has cells of dimension n but...

Scientific discoveries and technological advances are achieved through the expenditure of human and material resources. Clinical research and program development in mental health services are no exceptions. In the present rejoinder to Dr. Wakefield’s second critique, this point is briefly discussed as well as fallacies in his claim that across-setting generalization was the main reason why beha...

This is a set of lecture notes for introductory courses in mathematical logic offered at the Pennsylvania State University.

1. A. Rochon-Duvigneaud, Les Yeux et la Vision des Vertebres (Masson, Paris, 1943). 2. S. L. Polyak, The Vertebrate Visual System (Univ. of Chicago Press, Chicago, 1957). 3. G. L. Walls, The Vertebrate Eye (Cranbrook Institute of Science, Bloomfield Hills, Mich., 1942). 4. R. Shlaer, Science 176, 922 (1972). 5. Gratings of different manufacture, (i) engineruled gratings (Ronchi rulings) and (ii...

Two strategies are described for detecting constitutive or induced protein–protein interactions in intact mammalian cells; these strategies are based on oligomerization domain-assisted complementation of rationally designed fragments of the murine enzyme dihydrofolate reductase (DHFR; EC 1.5.1.3). We describe a dominant clonal-selection assay of stably transfected cells expressing partner prote...

My primary research interest is in computability and complexity theory. More specifically, I have an active research program in the area of effective dimension theory and randomness. Computability theory was first developed in the 1930s and ’40s by Alan Turing who has come to be seen, along with Gödel and Tarski, as one one of the founders of modern mathematical logic. The subject developed ove...

Elusive: Scientists from Paignton zoo in the UK have produced what is thought to be the first photograph of the endangered Ader’s duiker antelope in its native environment in Kenya. (Photo: Paignton Zoo Environmental Park.) were collected to investigate the potential for the use of DNA for establishing the identity of individuals. A satellite collar was also tested for its effectiveness for pot...