منابع مشابه
PROPER r - MAPS OF T - MODULES BY ALAN A
In investigating homotopy equivalences of smooth G-manifolds where G is a compact Lie group, Pétrie [3], [4], [5] makes use of proper G-maps of degree 1 from one G-module to another of the same complex dimension. The first nontrivial example of such a map, called a quasi-equivalence, was given by Pétrie [6] for two-dimensional S -modules. Necessary and sufficient conditions for the existence of...
متن کاملT-dual Rickart modules
We introduce the notions of T-dual Rickart and strongly T-dual Rickart modules. We provide several characterizations and investigate properties of each of these concepts. It is shown that every free (resp. finitely generated free) $R$-module is T-dual Rickart if and only if $overline{Z}^2(R)$ is a direct summand of $R$ and End$(overline{Z}^2(R))$ is a semisimple (resp. regular) ring. It is sho...
متن کاملt-dual rickart modules
we introduce the notions of t-dual rickart and strongly t-dual rickart modules. we provide several characterizations and investigate properties of each of these concepts. it is shown that every free (resp. finitely generated free) $r$-module is t-dual rickart if and only if $overline{z}^2(r)$ is a direct summand of $r$ and end$(overline{z}^2(r))$ is a semisimple (resp. regular) ring. it is sho...
متن کاملبررسی کاریوتیپی چهار گونه آویشن (Thymus spp) T. lancifolius) ،T. daenensis ، T. fedtschenkoi و pubescens T.)
آویشن (Thymus) از تیره Lamiaceae گیاهی است چند ساله که به‌دلیل خاصیت دارویی از اهمیت بالایی برخوردار است. بذرهای پنج جمعیت متعلق به چهار گونه T. Lancifolius،T. daenensis subsp. daenensis (دو نمونه)، T. fedtschenkoiو pubescens .Tکشت گردید و پس از جوانه‌زنی بذرها از مریستم انتهایی ریشه برای مطالعات کاریوتیپی استفاده شد. نتایج نشان داد که تعداد کروموزوم پایه در تمام جمعیت‌های مورد بررسی 15= x اس...
متن کاملA RAPID INTRODUCTION TO DRINFELD MODULES, t-MODULES, AND t-MOTIVES
The theory of Drinfeld modules was initially developed to transport the classical ideas of lattices and exponential functions to the function field setting in positive characteristic. This impulse manifested itself in work of L. Carlitz [9], who investigated explicit class field theory for Fq(θ) and defined the later named Carlitz module, which serves as the analogue of the multiplicative group...
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ژورنال
عنوان ژورنال: Bulletin of the American Mathematical Society
سال: 1975
ISSN: 0002-9904
DOI: 10.1090/s0002-9904-1975-13789-x