Boris Groys, Particular Cases

Boris Dubin

The ultra-weak Ash conjecture and some particular cases

The development of finite model theory is mainly due to the interest of the theoretical computer science community for this subject. For instance, in complexity theory, following the well known Fagin theorem [12] which states that existential second-order logic ESO exactly captures the complexity class NP, most complexity classes have been proved to have a logical characterization, see for inst...

Boris Ephrussi (1901-1979)

Boris Ephrussi studied fruit flies, yeast, and mouse [3] genetics and development while working in France and the US during the twentieth century. In yeast, Ephrussi studied how mutations in the cytoplasm persisted across generations. In mice he studied the genetics of hybrids and the development of cancer. Working with George Wells Beadle [4] on the causes of different eye colors in fruit flie...

CHAPTER FOUR PROTACTINIUM Boris

Protactinium, element 91, is one of the most rare of the naturally occurring elements and may well be the most difficult of all to extract from natural sources. Protactinium is, formally, the third element of the actinide series and the first having a 5f electron. The superconducting properties of protactinium metal provide clear evidence that Pa is a true actinide element (Smith et al., 1979)....

A high-order Boris integrator

This work introduces the high-order Boris-SDC method for integrating the equations of motion for electrically charged particles in an electric and magnetic fields. Boris-SDC relies on a combination of the Boris-integrator with spectral deferred corrections (SDC). SDC can be considered as preconditioned Picard iteration to compute the stages of a collocation method. In this interpretation, inver...