In this paper,a formula is given. The formula gives the number of prime number solutions of the indefinite equation p 1+p 2=2n , and based on it, an equivalent proposition to the conjecture of Goldbach is obtained.
Contemporary research documents a positive but weak price premium from environmental performance （EP）. The specific circumstances of pricing EP of large and small companies and in polluting and clean industries have...Contemporary research documents a positive but weak price premium from environmental performance （EP）. The specific circumstances of pricing EP of large and small companies and in polluting and clean industries have not, however, been investigated. This study predicts that financial markets price EP beyond financial fundamentals differently, depending on company size and the environmental risk of the industry and provides evidence relying on a set of the Sweden Stock Market 300 （SIX 300） companies listed on the Stockholm Stock Exchange （OMX Stockholm）. Applying a value relevance model, the average results are in line with previous findings that EP adds value beyond the book value of equity and earnings. The asymmetry in EP is, however, driven by company size and the environmental risk of the industry. This study suggests that large companies in low-risk industries obtain strong price premiums from being environmental industry leaders. In contrast, small companies and also companies in high-risk industries do not necessarily accrue the same market benefits.展开更多
In August 1950, the nuclear physicist Bruno Pontecorvo suddenly left Rome for Stockholm and disappeared without leaving any trace. Pontecorvo had joined the British atomic bomb project. His abrupt disappearance quickl...In August 1950, the nuclear physicist Bruno Pontecorvo suddenly left Rome for Stockholm and disappeared without leaving any trace. Pontecorvo had joined the British atomic bomb project. His abrupt disappearance quickly became an international affaire, causing much concern to the western intelligence services, who were worried about the escape of atomic secrets to the Soviet Union, especially after Fuchs＇ famous case. In the Union of Soviet Socialist Republics （USSR）, Pontecorvo was welcomed with honour, but also isolated from the rest of the world for many decades. He always denied any direct involvement in the Soviet nuclear programme. According to him, he moved to Russia because of his socialist beliefs, working only on particle physics and peaceful applications of atomic energy. Who was really Bruno Pontecorvo？ A pacifist like Robert Oppenheimer or a communist agent like Klaus Fuchs？ Did he have access to any information about the Manhattan Project during the war, thanks to his friendship with Enrico Fermi？ Did he spy on the Anglo-Canadian programme like Igor Gouzenko, before moving to Russia？ Did he join Soviet military projects across more than 30 years in Dubna？ The author will discuss how the perception of Pontecorvo＇s case changed in the public opinion from the 1950s until the 1990s, as a mirror of the tensions between the two blocks. The whole affaire was object of harsh political confrontation in Italy for almost 50 years. Therefore, the author will also focus on the role played by the Italian communists in Pontecorvo＇s defection to the USSR as well as on such a local debate, which reflects the history of the post-war Italian Communist Party （PCI） until the end of the Cold War.展开更多
The existence of opportunistic behavior by contractors or sub-contractors in the bidding process encouraged by the governance structure of construction companies as well as the kind of relationship that exist between ...The existence of opportunistic behavior by contractors or sub-contractors in the bidding process encouraged by the governance structure of construction companies as well as the kind of relationship that exist between contractors and clients is thought to have some bearing on the rising construction cost observed in some regions of Sweden. Three hypotheses that are intended to test the impact that long run relationship between contractors and developers, vertically integrated firms, and the increase of international competition could have on the construction cost increase levels were tested on a predetermined number of projects from six cities in different regions. The semi-structured survey produces inconclusive results. Long run and collaborative relationship was prevalent in small region though respondents in this region did not draw strong connection between construction cost increase levels and the kind of observed relationship. In Stockholm region, short-term relationship was mostly prevalent. Vertical integration and foreign competition impacts on construction costs were not significant in either region.展开更多
In this paper, we study the binary Goldbach problem in the set of the Piatetski-Shapiro primes. We obtain that for all most all large even integer n, the equationn = p1+p2, pi∈Pγi, i = 1, 2has solutions, where 0 &l...In this paper, we study the binary Goldbach problem in the set of the Piatetski-Shapiro primes. We obtain that for all most all large even integer n, the equationn = p1+p2, pi∈Pγi, i = 1, 2has solutions, where 0 < γ1,γ2 ≤ 1 are fixed real numbers, such that 73(1 - γ2) < 9, 73(1 - γ1) + 43(1 - γ2) < 9.展开更多
If the concept of proof （including arithmetic proof） is syntactically restricted to closed sentences （or their Godel numbers）, then the standard accounts of Godel＇s Incompleteness Theorems （and Lob＇s Theorem） ...If the concept of proof （including arithmetic proof） is syntactically restricted to closed sentences （or their Godel numbers）, then the standard accounts of Godel＇s Incompleteness Theorems （and Lob＇s Theorem） are blocked. In these standard accounts （Godel＇s own paper and the exposition in Boolos＇ Computability and Logic are treated as exemplars）, it is assumed that certain formulas （notably so called ＂Godel sentences＂） containing the Godel number of an open sentence and an arithmetic proof predicate are closed sentences. Ordinary usage of the term ＂provable＂ （and indeed ＂unprovable＂） favors their restriction to closed sentences which unlike so-called open sentences can be true or false. In this paper the restricted form of provability is called strong provability or unprovability. If this concept of proof is adopted, then there is no obvious alternative path to establishing those theorems.展开更多
Some of the seemingly important contributions made by Russell, Cantor and Godel regarding the foundations of mathematics lose credibility when addressed at a more fundamental level which assumes language consists of s...Some of the seemingly important contributions made by Russell, Cantor and Godel regarding the foundations of mathematics lose credibility when addressed at a more fundamental level which assumes language consists of symbols devoid of what they mean. Such an approach can reveal neglected assumptions which are of consequence when made explicit and which, in particular, mean that Hilbert in fact had no need to heed Godel＇s revolutionary results regarding the foundations of mathematics.展开更多
It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest sc...It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest scientific heritage, represented by the so-called golden age of Euclid, Archimedes and Apollonius, Ⅲ-Ⅱ century BC. Well, it is believed that with our complex concept of tradition of thought within which we insert not only epistemological concepts but also philosophical principles, historical and social frameworks, in stasis or in strong movement, processed by us, it is possible better interpret that happy moment of scientific constructions of the third and second century BC, as a result of the valorization of the deep travail and serious battle that preceded it between the fourth and fifth century BC. It is investigated in particular in our paper the development of astronomical thought between the fifth and fourth centuries BC, in the ancient Greek thought, and at last a particular presumed criticism by Archimedes in his Sandreckoner to Aristarchus.展开更多
In Critique of Pure Reason, Kant explains his critical method ＂as an experiment＂ in metaphysics. The aim of that ＂experiment＂ is to establish ＂an entire revolution＂ in philosophical thinking, which was initiated...In Critique of Pure Reason, Kant explains his critical method ＂as an experiment＂ in metaphysics. The aim of that ＂experiment＂ is to establish ＂an entire revolution＂ in philosophical thinking, which was initiated by the Copernican revolution in cosmology in order to find the secure path, and its possibility application to metaphysics. Kant＇s aim in Critique of Pure Reason is to rescue metaphysics from a ＂blind groping＂ by undertaking a revolution in metaphysics as Copernicus has brought to cosmology. Kant＇s Copernican turn consists in the assertion that the possibility of knowledge requires that ＂the objects must conform to our cognition.＂ From Kant＇s view, we can know only what we ＂construct,＂ ＂make,＂ or ＂produce＂ as a necessary condition of knowledge, but we cannot know the mind--independent external world, i.e., the world which is independent of us. Kant＇s epistemological constructivism is the central point to his Copernican revolution.展开更多
Although E Maddy （1997） says on naturalism： ＂This is not, in itself, a philosophy of mathematics [...]＂ （161）, already by its name, or by those whose interest has called on it （Quine, Putnam et al.） ... it an...Although E Maddy （1997） says on naturalism： ＂This is not, in itself, a philosophy of mathematics [...]＂ （161）, already by its name, or by those whose interest has called on it （Quine, Putnam et al.） ... it anyhow reveals desire to be it. Insofar as otherwise, the semantic potential of the word leaves far behind it （after all scarce） results it achieved from the relation of an exact （mathematical） expression and （overly rich） intuitive reality of Being. We plead here already from the perspective of the slogan ＂One and All＂ of the first philosopher： Tales, when by the number （which one forebodes） one could go to such an extent into areas of reality （Pythagoras）, or when （especially in the human sphere） is being over again actual final cause of Aristotle the philosophy and the mathematics to accomplish far more fruitful encounter with the Being. Alain Badiou （1988） has already pointed that： ＂Mathematics is ontology,＂ and the category theory in mathematics, having covered by itself other fields of this science, continues to find applications in a series of＂non-traditional＂ domains of reality. In that correlation the philosophy can express its （primary） needs for truth, justice, beauty, ... as well as for the overall development in the sense of purpose--also because of an undreamed power of the technological development （of hardwares and softwares） today. Namely, the naturalism in mathematics, which developed an abundant reflection on the place （importance of） the mathematical idiom in sciences--in the balance of criticism--has come rather to meager provisions, such as： ＂preestablished harmony of thinking,＂ ＂ontic commitment,＂ （Quine 1960） ＂the hygiene of mind,＂ （Maddy 1996） ＂success argument,＂ （Putnam 1975） ＂pragmatic argument,＂ （Resnik 1981） etc., which only are few places from the encounter of an exact expression such as is mathematical one and the reality of natuural sciences. Instead of philosophy of mathematics to radicalize its claims from the perspective of that （powerful） mathematical idiom and the excessive reality of Being and man＇s place in it--this time, in the spirit of biocosmology （neo-Aristotelism）.展开更多
文摘In this paper,a formula is given. The formula gives the number of prime number solutions of the indefinite equation p 1+p 2=2n , and based on it, an equivalent proposition to the conjecture of Goldbach is obtained.
文摘Contemporary research documents a positive but weak price premium from environmental performance （EP）. The specific circumstances of pricing EP of large and small companies and in polluting and clean industries have not, however, been investigated. This study predicts that financial markets price EP beyond financial fundamentals differently, depending on company size and the environmental risk of the industry and provides evidence relying on a set of the Sweden Stock Market 300 （SIX 300） companies listed on the Stockholm Stock Exchange （OMX Stockholm）. Applying a value relevance model, the average results are in line with previous findings that EP adds value beyond the book value of equity and earnings. The asymmetry in EP is, however, driven by company size and the environmental risk of the industry. This study suggests that large companies in low-risk industries obtain strong price premiums from being environmental industry leaders. In contrast, small companies and also companies in high-risk industries do not necessarily accrue the same market benefits.
文摘In August 1950, the nuclear physicist Bruno Pontecorvo suddenly left Rome for Stockholm and disappeared without leaving any trace. Pontecorvo had joined the British atomic bomb project. His abrupt disappearance quickly became an international affaire, causing much concern to the western intelligence services, who were worried about the escape of atomic secrets to the Soviet Union, especially after Fuchs＇ famous case. In the Union of Soviet Socialist Republics （USSR）, Pontecorvo was welcomed with honour, but also isolated from the rest of the world for many decades. He always denied any direct involvement in the Soviet nuclear programme. According to him, he moved to Russia because of his socialist beliefs, working only on particle physics and peaceful applications of atomic energy. Who was really Bruno Pontecorvo？ A pacifist like Robert Oppenheimer or a communist agent like Klaus Fuchs？ Did he have access to any information about the Manhattan Project during the war, thanks to his friendship with Enrico Fermi？ Did he spy on the Anglo-Canadian programme like Igor Gouzenko, before moving to Russia？ Did he join Soviet military projects across more than 30 years in Dubna？ The author will discuss how the perception of Pontecorvo＇s case changed in the public opinion from the 1950s until the 1990s, as a mirror of the tensions between the two blocks. The whole affaire was object of harsh political confrontation in Italy for almost 50 years. Therefore, the author will also focus on the role played by the Italian communists in Pontecorvo＇s defection to the USSR as well as on such a local debate, which reflects the history of the post-war Italian Communist Party （PCI） until the end of the Cold War.
文摘The existence of opportunistic behavior by contractors or sub-contractors in the bidding process encouraged by the governance structure of construction companies as well as the kind of relationship that exist between contractors and clients is thought to have some bearing on the rising construction cost observed in some regions of Sweden. Three hypotheses that are intended to test the impact that long run relationship between contractors and developers, vertically integrated firms, and the increase of international competition could have on the construction cost increase levels were tested on a predetermined number of projects from six cities in different regions. The semi-structured survey produces inconclusive results. Long run and collaborative relationship was prevalent in small region though respondents in this region did not draw strong connection between construction cost increase levels and the kind of observed relationship. In Stockholm region, short-term relationship was mostly prevalent. Vertical integration and foreign competition impacts on construction costs were not significant in either region.
基金Supported by the Foundation of Shandong Provincial Education Department(03F06)
文摘In this paper, we study the binary Goldbach problem in the set of the Piatetski-Shapiro primes. We obtain that for all most all large even integer n, the equationn = p1+p2, pi∈Pγi, i = 1, 2has solutions, where 0 < γ1,γ2 ≤ 1 are fixed real numbers, such that 73(1 - γ2) < 9, 73(1 - γ1) + 43(1 - γ2) < 9.
文摘If the concept of proof （including arithmetic proof） is syntactically restricted to closed sentences （or their Godel numbers）, then the standard accounts of Godel＇s Incompleteness Theorems （and Lob＇s Theorem） are blocked. In these standard accounts （Godel＇s own paper and the exposition in Boolos＇ Computability and Logic are treated as exemplars）, it is assumed that certain formulas （notably so called ＂Godel sentences＂） containing the Godel number of an open sentence and an arithmetic proof predicate are closed sentences. Ordinary usage of the term ＂provable＂ （and indeed ＂unprovable＂） favors their restriction to closed sentences which unlike so-called open sentences can be true or false. In this paper the restricted form of provability is called strong provability or unprovability. If this concept of proof is adopted, then there is no obvious alternative path to establishing those theorems.
文摘Some of the seemingly important contributions made by Russell, Cantor and Godel regarding the foundations of mathematics lose credibility when addressed at a more fundamental level which assumes language consists of symbols devoid of what they mean. Such an approach can reveal neglected assumptions which are of consequence when made explicit and which, in particular, mean that Hilbert in fact had no need to heed Godel＇s revolutionary results regarding the foundations of mathematics.
文摘It is argued that it has not yet been able to value the historical, philosophical and epistemological travail, represented by the filth and fourth centuries BC of the ancient Greek world, which preceded the highest scientific heritage, represented by the so-called golden age of Euclid, Archimedes and Apollonius, Ⅲ-Ⅱ century BC. Well, it is believed that with our complex concept of tradition of thought within which we insert not only epistemological concepts but also philosophical principles, historical and social frameworks, in stasis or in strong movement, processed by us, it is possible better interpret that happy moment of scientific constructions of the third and second century BC, as a result of the valorization of the deep travail and serious battle that preceded it between the fourth and fifth century BC. It is investigated in particular in our paper the development of astronomical thought between the fifth and fourth centuries BC, in the ancient Greek thought, and at last a particular presumed criticism by Archimedes in his Sandreckoner to Aristarchus.
文摘In Critique of Pure Reason, Kant explains his critical method ＂as an experiment＂ in metaphysics. The aim of that ＂experiment＂ is to establish ＂an entire revolution＂ in philosophical thinking, which was initiated by the Copernican revolution in cosmology in order to find the secure path, and its possibility application to metaphysics. Kant＇s aim in Critique of Pure Reason is to rescue metaphysics from a ＂blind groping＂ by undertaking a revolution in metaphysics as Copernicus has brought to cosmology. Kant＇s Copernican turn consists in the assertion that the possibility of knowledge requires that ＂the objects must conform to our cognition.＂ From Kant＇s view, we can know only what we ＂construct,＂ ＂make,＂ or ＂produce＂ as a necessary condition of knowledge, but we cannot know the mind--independent external world, i.e., the world which is independent of us. Kant＇s epistemological constructivism is the central point to his Copernican revolution.
文摘Although E Maddy （1997） says on naturalism： ＂This is not, in itself, a philosophy of mathematics [...]＂ （161）, already by its name, or by those whose interest has called on it （Quine, Putnam et al.） ... it anyhow reveals desire to be it. Insofar as otherwise, the semantic potential of the word leaves far behind it （after all scarce） results it achieved from the relation of an exact （mathematical） expression and （overly rich） intuitive reality of Being. We plead here already from the perspective of the slogan ＂One and All＂ of the first philosopher： Tales, when by the number （which one forebodes） one could go to such an extent into areas of reality （Pythagoras）, or when （especially in the human sphere） is being over again actual final cause of Aristotle the philosophy and the mathematics to accomplish far more fruitful encounter with the Being. Alain Badiou （1988） has already pointed that： ＂Mathematics is ontology,＂ and the category theory in mathematics, having covered by itself other fields of this science, continues to find applications in a series of＂non-traditional＂ domains of reality. In that correlation the philosophy can express its （primary） needs for truth, justice, beauty, ... as well as for the overall development in the sense of purpose--also because of an undreamed power of the technological development （of hardwares and softwares） today. Namely, the naturalism in mathematics, which developed an abundant reflection on the place （importance of） the mathematical idiom in sciences--in the balance of criticism--has come rather to meager provisions, such as： ＂preestablished harmony of thinking,＂ ＂ontic commitment,＂ （Quine 1960） ＂the hygiene of mind,＂ （Maddy 1996） ＂success argument,＂ （Putnam 1975） ＂pragmatic argument,＂ （Resnik 1981） etc., which only are few places from the encounter of an exact expression such as is mathematical one and the reality of natuural sciences. Instead of philosophy of mathematics to radicalize its claims from the perspective of that （powerful） mathematical idiom and the excessive reality of Being and man＇s place in it--this time, in the spirit of biocosmology （neo-Aristotelism）.
