Leopold Lewicki – nauczyciel bez katedry

Leopold Schenk (1840-1902).

Leopold Schenk attained international fame by his contributions to the science of embryology. The first chair of embryology in any medical school was established for him in the University of Vienna. This article briefly describes his life and his work.

Leopold Fejér: in Memoriam 1880-1959

On October IS, 1959, Leopold Fejér died in Budapest, Hungary. For the past half century Fejér was a central figure of the international mathematical community and a leading personality of his native country. He had many pupils scattered all over the world and many friends and admirers in all countries where mathematics is at home. His profound influence was due not only to his deep and fundamen...

Joseph Leopold Auenbrugger--founder of percussion technique.

Knowledge of acoustics and sound, an interest in music and his familiarity with tapping the wine barrels in his father’s inn, helped Auenbrugger develop the science of percussion. An empty barrel or a normal chest, gave a resonant sound on percussion, while a barrel filled with wine or the pleural cavity filled with an effusion, gave out a different note. He was also able to outline the cardiac...

A Note on Lewicki-Sejnowski Gradient for Learning Overcomplete Representations

Overcomplete representations have greater robustness in noise environment and also have greater flexibility in matching structure in the data. Lewicki and Sejnowski (2000) proposed an efficient extended natural gradient for learning the overcomplete basis and developed an overcomplete representation approach. However, they derived their gradient by many approximations, and their proof is very c...

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