There have been many discussions on problems of logic over the past several years. While the problem of the nature of the law of contradiction, one of the laws of formal logic, has received particular attention by everyone, the question has not been posed very precisely in the arguments. Actually, the question is not whether the movement, change, and development of things can be reflected in consciousness by use of the methods of formal logic, or in distinguishing the effectiveness of (...) the law of contradiction in disputation, proofs, or theoretical systems from its effectiveness in the general process of cognition, when applied to phenomena. If the development of reality cannot at all be reflected by the use of the logical tools of formal logic, what use do they have? No one denies that formal logic does not suffice as a method of cognition. If, in disputations and proofs, or in the establishment of theoretical systems, one relies only on the logical tools of formal logic, this is also not enough. The scope of applicability of the laws of formal logic, as laws that are studied by a concrete science, is necessarily limited. It is impossible for them to be all-powerful; it is of course impossible, relying on the law of contradiction, to know and grasp the contradictions in reality — the unity and conflict of opposites. All disputations and proofs, and the establishment of theoretical systems, are, in fact, efforts to know real objects, efforts of the subjective to grasp the objective. In principle, the use of formal logic in disputations and proofs and in the establishment of theoretical systems, and its use in knowing an object, should be no different. What, then, is the question? The question should be posed as follows: can thought contravene the law of contradiction? (shrink)

Mereological theories are based on the binary relation “being a part of”. The systematic investigations of mereology were initiated by Leśniewski. More recent authors (including Simons, Casati and Varzi, Hovda) formulated a series of first‐order mereological axioms. These axioms give rise to a plenitude of theories, which are of great philosophical interest. The paper considers first‐order mereological theories from the point of view of computable (or effective) algebra. Following the approach of Hirschfeldt, Khoussainov, Shore, and Slinko, we isolate two important (...) computability‐theoretic properties P (namely, degree spectra of structures, and effective dimensions), and consider the following problem: for a given mereological theory T, is it true that its models can realize every possible variant of the property P? If the answer is positive, then we say that the theory T is ‐universal. We obtain the following results about known mereological theories. Any theory T which is weaker than Extensional Closure Mereology (CEM) is ‐universal. A similar fact is true for the theory GM2. On the other hand, any theory stronger that CEM + (C) + (G) is not ‐universal. In particular, General Extensional Mereology is not ‐universal. (shrink)

An ever more aggressive anti-migration propaganda war is being waged by the majority of British media, where migration in any form is consistently portrayed on the basis of forming and consolidating a response to a security threat. While tens of thousands of migrant workers are exchanging their sweated labour for meagre wages in the 3-D jobs — dirty, dangerous and degrading — in Britain's food-processing, electronic manufacturing, catering, cleaning and hospitality industries outside any mechanism of labour protection, Britain today is (...) still declining to at least ratify the UN Convention on the Rights of Migrant Workers and Their Families in effect since last year. In the post-Morecambe debate on migration and demand for regularizing gangmasters, policing and immigration raids are seen as the quick cure for migrant labour exploitation. The argument sounds as if the only way to get rid of employers’ violation of minimum labour rights is to get rid of migrant workers. Britain has forgotten to ask — who are the migrant workers? They are the ones who sweep British roads, clean British supermarkets and serve you food in restaurants in every high street. They are the ones who sew the clothes you wear, put together your microwaves and process the British salads that you have on your dinner table everyday. Migrant workers are people you don't meet everyday but upon whom you depend. To find out about the chain of exploitation in which migrant workers live and the impact of British immigration controls that are fundamental to their lives, I lived undercover among the Chinese workers from whom I learnt a great deal. (shrink)

Everybody knows that the Revolution of 1911 was an anti-imperialist and antifeudal democratic revolution led by the revolutionary and democratic group of the bourgeoisie in the period of the old democratic revolution in China. The leader of that revolution was Sun Yat-sen, and the guiding ideology was his old Three People's Principles. It is well known that Chairman Mao has made a series of scientific appraisals of these facts, but the newspapers and magazines controlled by the anti-Party clique of Wang (...) Hung-wen, Chang Ch'un-ch'iao, Chiang Ch'ing and Yao Wen-yuan openly oppose Chairman Mao's scientific appraisals, betraying the fundamental principles of Marxism, distorting the Revolution of 1911 as a struggle between Confucians and Legalists, and replacing Sun Yat-sen as the standard-bearer of the revolution with Chang T'ai-yen, who played first an active and then a devastating role in the revolution. All this is part of the clique's attack on the Party in order to usurp the Party, seize power, restore capitalism and fabricate the "history" of the struggle between the Confucians and the Legalists. (shrink)