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We describe a Gauss decomposition for the Yangian Y (gl m|n) of the general linear Lie su-peralgebra. This gives a connection between this Yangian and the Yangian of the classical Lie superalgebra Y (A(m − 1, n − 1)) (with m = n) defined and studied in papers by Stukopin, and suggests natural definitions for the Yangians Y (sl n|n) and Y (A(n, n)). We also(More)
This study investigated the use of the Porteus Maze test as a measure of reflection/impulsivity when used with both normal and retarded subjects. Study 1 (N = 90) provided sample data for three equal groups of 30 adolescent students in the regular school. These were defined as above average, average, and below average in general intelligence. In addition to(More)
This thesis is concerned with extending some well-known results about the Yan-gians Y (gl N) and Y (sl N) to the case of super-Yangians. First we produce a new presentation of the Yangian Y (gl m|n), using the Gauss decomposition of a matrix with non-commuting entries. Then, by writing the quantum Berezinian in terms of generators from the new presentation(More)
Brundan and Kleshchev recently introduced a new family of presentations of the Yangian Y (gl n) associated to the general linear Lie algebra gl n , and thus provided a fresh approach to its study. In this article, we would like to show how some of their ideas can be fruitfully extended to consider the Yangian Y (gl m|n) associated to the Lie superalgebra gl(More)
  • K Y Mak, L Gow
  • 1996
BACKGROUND The aim was to assess the clinical usefulness and economic viability of an aftercare worker for psychotic patients discharged from half-way houses in Hong Kong. METHOD A sample of 32 chronic psychotic patients was provided with a full-time aftercare worker. A matched control group received no such service. RESULTS The experimental group was(More)
  • K Y Mak, L Gow
  • 1991
This paper reports on a study of the living environment of 64 psychiatric patients discharged from half-way houses in Hong Kong. The majority were living in a deprived situation compared to that of their neighbours. They were leading a very monotonous life throughout the year; the walls of their homes were dirty and very plain; and some even ate scraps from(More)
This study investigated the feasibility of using measures of cognitive tempo with 66 institutionalized moderately-severely retarded adolescents and adults in the field settings of three Activity Centres--one rural and two urban. The Matching Familiar Figures Test and the Porteus Maze Tests could, with characteristic modifications, be administered to this(More)
This study investigated the effects of modification of conceptual tempo on the skilled performance of a group of mildly intellectually handicapped adolescents receiving training in a work preparation centre (N, 41). On the basis of performance on Kagan's Matching Familiar Figures Test the group was divided into two subgroups, reflective, impulsive and then(More)
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