Autor: Jean-Francois Pommaret

The concept of "group" has been introduced in mathematics for the first time by E. Galois (1830) and slowly passed from algebra to geometry with the work of S. Lie on Lie groups (1880) and …

Rapid eye movement sleep (REM sleep) is a normal stage of sleep characterized by the random movement of the eyes. REM sleep is classified into two categories: tonic and phasic and criteria for REM …