Validation of psychological tests has not yet been adequately conceptualized, as the APA Committee on Psychological Tests learned when it undertook (1950-54) to specify what qualities should be investigated before a test...

This article from the magazine The Economist argues that the notion of mathematical proof is now in flux and that "the use of computers to prove mathematical theorems is forcing mathematicians to re-examine the...

This is the homepage of an online journal that disseminates "articles that significantly advance the study of categorical algebra or methods, or that make significant new contributions to mathematical science using...