Weakly semirecursive sets

1990 ◽  
Vol 55 (2) ◽  
pp. 637-644 ◽  
Author(s):  
Carl G. Jockusch ◽  
James C. Owings
Keyword(s):  
The Other ◽  
Turing Degrees ◽  
Boolean Combination ◽  
Knowing How ◽  
Other Hand ◽  
Open Questions ◽  
Semirecursive Set

AbstractWe introduce the notion of “semi-r.e.” for subsets of ω, a generalization of “semirecursive” and of “r.e.”, and the notion of “weakly semirecursive”, a generalization of “semi-r.e.”. We show that A is weakly semirecursive iff, for any n numbers x1, …,xn, knowing how many of these numbers belong to A is equivalent to knowing which of these numbers belong to A. It is shown that there exist weakly semirecursive sets that are neither semi-r.e. nor co-semi-r.e. On the other hand, we exhibit nonzero Turing degrees in which every weakly semirecursive set is semirecursive. We characterize the notion “A is weakly semirecursive and recursive in K” in terms of recursive approximations to A. We also show that if a finite Boolean combination of r.e. sets is semirecursive then it must be r.e. or co-r.e. Several open questions are raised.

scholarly journals Socio-political-environmental perceptions of participants in the public hearings of the Brazilian Representative House on Environment

2021 ◽  
Vol 24 ◽  
Author(s):  
Antonio Teixeira de Barros
Keyword(s):  
Sustainable Development ◽  
The Other ◽  
Government Agencies ◽  
Environmental Perceptions ◽  
The Public ◽  
Other Hand ◽  
Open Questions ◽  
Public Hearings ◽  
Chamber Of Deputies

Abstract The article analyzes the perceptions of the citizens who participated in the public hearings promoted by the Committee on Environment and Sustainable Development (CMADS) of the Chamber of Deputies during the year 2018. The methodology consisted in the use of a questionnaire with open and closed questions applied to a sample of 71.22% of the public that was present at these events. For the study of perceptions, open questions are particularly relevant, since they consist of arguments, analyzes and justifications presented by citizens, based on the experience of participating. The conclusions show that a diversity of citizens’ perceptions of the CMADS agenda, the topics under debate and the participation of technicians and representatives of entities from the environmental field. On the other hand, there are critical opinions in relation to the performance of parliamentarians, representatives of government agencies and the dynamics of debates.

scholarly journals LUMINOSITIES OF RADIO PULSARS

2013 ◽  
Vol 22 (10) ◽  
pp. 1330021 ◽  
Author(s):  
MANJARI BAGCHI
Keyword(s):  
Power Law ◽  
Globular Clusters ◽  
Galactic Disk ◽  
Intrinsic Property ◽  
Magnetospheric Plasma ◽  
The Other ◽  
Radio Pulsars ◽  
Beam Geometry ◽  
Other Hand ◽  
Open Questions

Luminosity is an intrinsic property of radio pulsars related to the properties of the magnetospheric plasma and the beam geometry, and inversely proportional to the observing frequency. In traditional models, luminosity has been considered as a function of the spin parameters of pulsars. On the other hand, parameter independent models like power law and lognormal have been also used to fit the observed luminosities. Some of the older studies on pulsar luminosities neglected observational biases, but all of the recent studies tried to model observational effects as accurately as possible. Luminosities of pulsars in globular clusters (GCs) and in the Galactic disk have been studied separately. Older studies concluded that these two categories of pulsars have different luminosity distributions, but the most recent study concluded that those are the same. This paper reviews all significant works on pulsar luminosities and discusses open questions.

Para leer la espiritualidad de san Agustín. Elementos culturales

Augustinus ◽  
2020 ◽  
Vol 65 (1) ◽  
pp. 23-51
Author(s):  
Vittorino Grossi ◽  
Keyword(s):  
The Other ◽  
Other Hand ◽  
Open Questions ◽  
The Future ◽  
Classical Culture

The article offers an outline of the context of the classical culture in which Christianity developed in the first three centuries, highlighting the humanistic culture of Seneca, the neo-Pythagorean school of the Sextii and the popular preaching of the Cynical Philosophers. On the other hand, the context of classical culture in Christianity of the 4th and 5th centuries is addressed, to highlight the problems that arose when trying to combine “culture” and Christianity. As an example of this problem, the case of Basil the Great and his Discourse to the young is offered. Subsequently, the article presents a series of open questions about the future of spirituality in relationship with «culture / cultures». The article ends with a discussion about Roman Paideia and the Christian Paideia.

A First Essay in Imaginative African Literature

Africa ◽  
1936 ◽  
Vol 9 (3) ◽  
pp. 350-358 ◽  
Author(s):  
R. M. East
Keyword(s):  
African Literature ◽  
The Other ◽  
Knowing How ◽  
The Road ◽  
Other Hand ◽  
Opening Paragraph ◽  
Better Than ◽  
The Way

Opening ParagraphA Snake was out riding on his horse (runs a Hausa fable) when he met a Frog. ‘That is not the way to ride,’ said the Frog,‘all curled up in the saddle. If you get down, I will show you.’ The Snake dismounted, and gave his horse to the Frog. The Frog mounted, and sitting firmly in the saddle galloped twice down the road and back. ‘That is the way to ride,’ he said, as he dismounted. ‘Very good indeed,’ said the Snake; ‘and now give me back my horse. Having is better than knowing how. Since you have no horse, your horsemanship is of little use to you. I, on the other hand, having a horse, need not learn to ride, unless I wish.’

scholarly journals Studio Education at FA CTU, its Current and Possible Structuring

2019 ◽  
pp. 198-203
Author(s):  
Adéla Chmelová
Keyword(s):  
Landscape Architecture ◽  
Educational Process ◽  
The Other ◽  
Field Of Study ◽  
Teaching Process ◽  
Knowing How ◽  
Other Hand ◽  
Ideal Composition ◽  
Insight Into ◽  
The Ideal

Recently, I left the educational process at the Faculty of architecture and was given the opportunity to work as an assistant at the studio classes (so-called atelier). As a fresh graduate, I entered the teaching process with the student's insight, but gradually I was confronted with the situation on the ‘other side’. The position of the fresh graduate has many advantages. For example, still up-to-date insight into the bureaucratic system of the faculty — with other words, knowing how it goes. On the other hand, one encounters questions: how to teach properly? In the present days a new field of study is still forming at the faculty: Landscape architecture, which was previously brought into the curriculum in the form of a module focused on garden and landscape architecture. There is room for some possible changes. At the faculty, questions also are arising on what the ideal composition of subjects of this newly shaped field should be, how much it has to do with architecture and how it is projecting in the environment disciplines.

Embedding jump upper semilattices into the Turing degrees

2003 ◽  
Vol 68 (3) ◽  
pp. 989-1014 ◽  
Author(s):  
Antonio Montalbán
Keyword(s):  
Partial Ordering ◽  
The Other ◽  
Turing Degrees ◽  
Upper Semilattice ◽  
Existential Theory ◽  
Other Hand ◽  
Unary Operator

AbstractWe prove that every countable jump upper semilattice can be embedded in , where a jump upper semilattice (jusl) is an upper semilattice endowed with a strictly increasing and monotone unary operator that we call jump, and is the jusl of Turing degrees. As a corollary we get that the existential theory of 〈D, ≤T, ∨, ′〉 is decidable. We also prove that this result is not true about jusls with 0, by proving that not every quantifier free 1-type of jusl with 0 is realized in . On the other hand, we show that every quantifier free 1-type of jump partial ordering (jpo) with 0 is realized in . Moreover, we show that if every quantifier free type, p(x1,…, xn), of jpo with 0, which contains the formula x1 ≤ 0(m) & … & xn ≤ 0(m) for some m, is realized in , then every quantifier free type of jpo with 0 is realized in .We also study the question of whether every jusl with the c.p.p. and size is embeddable in . We show that for the answer is no, and that for κ = ℵ1 it is independent of ZFC. (It is true if MA(κ) holds.)

scholarly journals Motivation and Preferences of Visitors in the Bohemian Paradise UNESCO Global Geopark

Geosciences ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 116
Author(s):  
Emil Drápela ◽  
Artur Boháč ◽  
Hynek Böhm ◽  
Kamil Zágoršek
Keyword(s):  
Research Methods ◽  
Questionnaire Survey ◽  
The Other ◽  
Other Hand ◽  
Open Questions ◽  
The Future ◽  
Mental Map ◽  
High Season ◽  
Tourist Infrastructure ◽  
Pressure Driven

There are some localities in the Bohemian Paradise Geopark that suffer from temporal overtourism in the high season. On the other hand, more than half of the geopark is not so often visited by tourists, although very attractive geosites can be found there too. In the most visited localities, nature is damaged due to overloading of the tourist infrastructure, while elsewhere there is pressure driven by municipalities to increase the number of tourists. For this reason, we organized a large questionnaire survey in summer 2020, which aimed to reveal the motivation of visitors of the geopark and their preferences regarding the places visited. The questionnaire combined several research methods: graphic scales, qualitative open questions, mental map, etc. The analysis of visitors’ answers shows that most of them cannot be described as geotourists, i.e., tourists who are primarily interested in geology and conceive their holiday as a sightseeing stay. Many tourists like to stay in nature without an educational element. We also found that there is a higher proportion of ecotourists and geotourists in less-visited geosites because they appreciate even lesser-known localities and crowds of tourists rather than repel them. The question for the future is, therefore, whether the geopark should strive for greater promotion of lesser-known localities, which would attract even mainstream tourists, or, conversely, to protect these geosites, it should promote only the most visited localities (which are already damaged).

A Hitherto Unpublished Taiping Document

1976 ◽  
Vol 39 (1) ◽  
pp. 150-154
Author(s):  
C. A. Curwen
Keyword(s):  
The Other ◽  
Knowing How ◽  
The Public ◽  
Other Hand ◽  
Public Record ◽  
First Time

In spite of over 14 years of activity—most of which was of a military nature—hardly any Taiping military despatches have survived or, if they have, they remain to be discovered. The only copy of this rare example, published here for the first time, is in the Public Record Office (series 682, No. 275/A3). It was amongst the documents found in the office of the Governor-General of Kwangtung and Kwangsi, on the occasion of the British capture and occupation of Canton in 1858. There is no means of knowing how accurately it was copied; on the other hand, there is no reason to question its authenticity or accuracy.

scholarly journals Invasive versus Non Invasive Methods Applied to Mummy Research: Will This Controversy Ever Be Solved?

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Despina Moissidou ◽  
Jasmine Day ◽  
Dong Hoon Shin ◽  
Raffaella Bianucci
Keyword(s):  
Soft Tissue ◽  
Minimally Invasive ◽  
Direct Contact ◽  
The Other ◽  
Museum Specimens ◽  
Non Invasive ◽  
Ancient Egyptian ◽  
Other Hand ◽  
Open Questions ◽  
Invasive Techniques

Advances in the application of non invasive techniques to mummified remains have shed new light on past diseases. The virtual inspection of a corpse, which has almost completely replaced classical autopsy, has proven to be important especially when dealing with valuable museum specimens. In spite of some very rewarding results, there are still many open questions. Non invasive techniques provide information on hard and soft tissue pathologies and allow information to be gleaned concerning mummification practices (e.g., ancient Egyptian artificial mummification). Nevertheless, there are other fields of mummy studies in which the results provided by non invasive techniques are not always self-explanatory. Reliance exclusively upon virtual diagnoses can sometimes lead to inconclusive and misleading interpretations. On the other hand, several types of investigation (e.g., histology, paleomicrobiology, and biochemistry), although minimally invasive, require direct contact with the bodies and, for this reason, are often avoided, particularly by museum curators. Here we present an overview of the non invasive and invasive techniques currently used in mummy studies and propose an approach that might solve these conflicts.

scholarly journals A Review On Some Concepts and Open Questions In Neutrosophic Algebraic Structures

2021 ◽  
Author(s):  
Rozina Ali ◽  
Keyword(s):  
The Other ◽  
Complex Numbers ◽  
Algebraic Structures ◽  
Open Problems ◽  
Other Hand ◽  
Open Questions

The aim of this paper is to present a study about recent progressions in the study of neutrosophic algebraic structures. Also, it lists the most interesting open questions about neutrosophic algebraic structures such as neutrosophic rings, refined neutrosophic rings, and n-refined neutrosophic rings. On the other hand, a study on the neutrosophic rings of complex numbers has been presented, with many Smarandache-Kandasamy open problems about the properties of these numbers, especially algebraic ones.

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