منابع مشابه
Some Questions on Unique
The simplest type of integral extension of a unique factorization domain B is obtained by adjoining to B an n-th root of one of its elements; that is, by forming the ring Bn = B[z]=(z n g), where n 2 Z and g 2 B. When n = 1, Bn = B. When n 2 it is natural to ask for what g 2 B will unique factorization be preserved? The case where B is a polynomial ring over an algebraically closed eld k immedi...
متن کاملthe effects of cooperative versus individual directed reading thinking activities on students inferential and referential questions
two groups of students were assigned as experimental and control ones, and were given instruction on directed reading-thinking activities and after some treatment, they were post-tested. although the initial pre-test did not show any significant differences, the final post-test result revealed that the cooperative reading comprehension helped the experimental group. the cooperative students’...
15 صفحه اولOn Some Questions of Rationality and Decidability
In this note we begin by resolving (in the negative) a question posed by Paz [6, Open Problem 1, p. 65] concerning the existence of an effective procedure for determining whether a recursively specified "probabilistie input-output relation" is of finite rank. To show that such an algorithm does not exist, it is enough to prove the undecidability of the corresponding problem for "probabilistic w...
متن کاملSome Questions
These are some questions I am every interested in. Your solution to any question in this draft would be welcome. I keep updating this draft. 1. Classical recursion theory We use R to denote the partial ordering of r.e. degrees and Dn to denote the partial ordering of n-r.e. degrees. Yang and I proved thatR is not a Σ1-substructure of Dn. Question 1.1 (Khoussainov). For n > 1, is there a functio...
متن کاملSome Questions of Arhangel ’ skii on Rotoids
Harold Bennett, Mathematics Department, Texas Tech University, Lubbock, TX 79409, Dennis Burke, Mathematics Department, Miami University, Oxford, OH 45056, and David Lutzer1, Mathematics Department, College of William and Mary, Williamsburg, VA 23187 Abstract: A rotoid is a space X with a special point e ∈ X and a homeomorphism F : X2 → X2 having F (x, x) = (x, e) and F (e, x) = (e, x) for ever...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Assurance Magazine and Journal of the Institute of Actuaries
سال: 1855
ISSN: 2046-1658
DOI: 10.1017/s2046165800050383