منابع مشابه
q-Serre relations and the Dolan-Grady relations
We define an algebra on two generators which we call the Tridiagonal algebra, and we consider its irreducible modules. The algebra is defined as follows. Let K denote a field, and let β, γ, γ∗, ̺, ̺∗ denote a sequence of scalars taken from K. The corresponding Tridiagonal algebra T is the associative K-algebra with 1 generated by two symbols A, A∗ subject to the relations [A,AA − βAAA+AA − γ(AA∗ ...
متن کاملMeasuring stellar magnetic fields with the low resolution spectropolarimeter of the William Herschel Telescope
Despite the influence of magnetic fields on the structure and evolution of stars is largely demonstrated from the theoretical point of view, their observational evidence in nondegenerated stars is still rather scanty and mainly circumscribed to bright objects (V<10). Stellar magnetic fields are commonly measured on the basis of circular spectropolarimetry at high/middle resolution across the pr...
متن کاملWilliam Harvey
as part of the moral order on the one hand and as pathological phenomena on the other. Dr. Riese writes interestingly of his seventeenth century theorists, and the reader will find much of what he has to say rewarding, especially with respect to the work of medical men so little known as de la Forge and de la Chambre. Rather than praise the obvious merits of Dr. Riese's monograph, however, I sh...
متن کاملWilliam Theurkauf
between sound and meaning within vast possible variations in the items under comparison, reducing the possibility of chance similarity. In contrast, there is a 'poverty of choice' of some other language features. " For example there are only six permutations for the ordering of the subject, object and verb that a language can use. Accordingly, there is a one in six chance that any two languages...
متن کاملWilliam Earnshaw
habitats directives. It is the fi rst such report to include EU-wide data on bird populations and the second one on habitat quality. While just over half of European bird species are listed as “secure”, the report fi nds that one in three European bird species is now threatened, including formerly common species such as the skylark and the turtle dove, whose populations shrank by 50 and 80%, re...
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ژورنال
عنوان ژورنال: Mycologia
سال: 1976
ISSN: 0027-5514,1557-2536
DOI: 10.1080/00275514.1976.12019933