Lawrence Bragg

Lawrence Bragg, microdiffraction and X-ray lasers.

We trace the historical development of W. L. Bragg's `law' and the key experimental observation which made it possible using polychromatic radiation at a time when neither X-ray wavelengths nor cell constants were known. This led, through his phasing and solving large mineral structures (without use of a computer), to work on metals, proteins, bubble rafts and his X-ray microscope. The relation...

On the structure of aragonite -- Lawrence Bragg revisited.

The structure of aragonite was first determined by Lawrence Bragg in 1924 in what is the now standard space-group setting Pnma (No. 62). Subsequent studies have all taken his structure as their starting points, despite Bragg's own stated doubts and some earlier etching studies which indicated that the underlying symmetry may really be polar. We have reinvestigated the structure and found that t...

Lawrence Kruger

Higher Lawrence configurations

Any configuration of lattice vectors gives rise to a hierarchy of higher-dimensional configurations which generalize the Lawrence construction in geometric combinatorics. We prove finiteness results for the Markov bases, Graver bases and facet posets of these configurations, and we discuss applications to the statistical theory of log-linear models.

Lawrence Katz (1956–2005)

Lawrence C. Katz died of melanoma on November 26, 2005, at the age of 48. He was amongst the most creative and influential neuroscientists of his time. His contributions were both scientific and personal, providing as much to the development of people as to scientific discovery. These affections were always inextricably intertwined, his love of scientific beauty and discovery, and his caring fo...