Array nonrecursiveness and relative recursive enumerability

2012 ◽  
Vol 77 (1) ◽  
pp. 21-32 ◽  
Author(s):  
Mingzhong Cai

AbstractIn this paper we prove that a degree a is array nonrecursive (ANR) if and only if every degree b ≥ a is r.e. in and strictly above another degree (RRE). This result will answer some questions in [ASDWY]. We also deduce an interesting corollary that every n-REA degree has a strong minimal cover if and only if it is array recursive.

2013 ◽  
Vol 34 (12) ◽  
pp. 2905-2912
Author(s):  
Jing-li Yang ◽  
Yong-hui Xu ◽  
Shou-da Jiang

2019 ◽  
pp. 44-54
Author(s):  
Shelley Ingram

One of the primary criticisms of fandom and fanfiction writers is that they are trespassing on grounds best left preserved for the “professionals.” Their very existence threatens the boundaries between expert and amateur, between trained artists and “usurpers.” This chapter surveys the debates surrounding the proper place of fanfiction and other fan-produced work in the hierarchy of both folklore studies and artistic production in general, arguing that such debates are an interesting corollary to discussions about fraudulent folklore and the amateur folklorist.


1967 ◽  
Vol 10 (4) ◽  
pp. 595-596 ◽  
Author(s):  
Kwangil Koh

Let R be a topological (Hausdorff) ring such that for each a ∊ R, aR and Ra are closed subsets of R. We will prove that if the set of non - trivial right (left) zero divisors of R is a non-empty set and the set of all right (left) zero divisors of R is a compact subset of R, then R is a compact ring. This theorem has an interesting corollary. Namely, if R is a discrete ring with a finite number of non - trivial left or right zero divisors then R is a finite ring (Refer [1]).


1970 ◽  
Vol 2 (2) ◽  
pp. 261-265
Author(s):  
Jason Gait

Gillman-Henriksen have defined a class of spaces, containing the discrete spaces and their Stone-Čech compactifications, called F'-spaces. The dyadic spaces are the continuous images of products of finite discrete spaces – a class which contains the compact metric spaces and all compact topological groups. In this paper it is shown that F'-spaces have no infinite dyadic sutspaces and, almost always, no dyadic compactifications. An interesting corollary is that if βX \ X is dyadic, then X is pseudocompact.


2001 ◽  
Vol 267 (1-2) ◽  
pp. 3-16 ◽  
Author(s):  
C. Câmpeanu ◽  
N. Sântean ◽  
S. Yu
Keyword(s):  

1994 ◽  
Vol 33 (5) ◽  
pp. 321-346 ◽  
Author(s):  
Peter A. Cholak ◽  
Peter G. Hinman

2015 ◽  
Vol 89 ◽  
pp. 569-583 ◽  
Author(s):  
Miłosz Kadziński ◽  
Roman Słowiński ◽  
Salvatore Greco

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