Saul Kripke has advanced interesting metaphysical and semantic claims that have strong appeal and engender conviction. In some cases, Kripke suggests that these claims constitute only a ‘picture’ rather than a theory, while in others, it is clear that the claims in question constitute a (formally) precise theory. In the former case, it is important to determine whether one can turn the picture ...

Though Frege was interested primarily in reducing mathematics to logic, he succeeded in reducing an important part of logic to mathematics by defining relations in terms of functions. By contrast, Whitehead & Russell reduced an important part of mathematics to logic by defining functions in terms of relations (using the definite description operator). We argue that there is a reason to prefer W...

On March 4, Dr. Oppenheimer replied to General Nichols’ letter of December 23, 1953. The complete text is printed below.

Jane Marion Oppenheimer [5], embryologist and historian of science and medicine, was born on 19 September 1911 in Philadelphia, Pennsylvania, to Sylvia Stern and James H. Oppenheimer. After studying zoology at Bryn Mawr College [6], Oppenheimer received her AB degree in 1932. Oppenheimer received her PhD in embryology [7] at Yale University [8] in 1935 and worked as a research fellow from 1935?...

It is well documented that chemical additives (grinding aid “GA”) during grinding can increase mill throughput, reduce water and energy consumption, narrow the particle size distribution of products, improve material flowability. These advantages have been linked to their effects on rheology, although there a gap in understanding GA effectiveness mechanism flow properties. The present study aim...

Extended Lagrangian Born-Oppenheimer molecular dynamics [A. M. N. Niklasson, Phys. Rev. Lett. 100, 123004 (2008)] is formulated for general Hohenberg-Kohn density-functional theory and compared with the extended Lagrangian framework of first principles molecular dynamics by Car and Parrinello [Phys. Rev. Lett. 55, 2471 (1985)]. It is shown how extended Lagrangian Born-Oppenheimer molecular dyna...