منابع مشابه
On reflexive subobject lattices and reflexive endomorphism algebras
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Emergence has a long and controversial history. In this paper we briefly review the primary strands of the debate, paying attention to its use in the fields of philosophy of science and mind, social science and systems theory including the theory of complex systems. We argue that it is important to recognize why emergence in social systems is fundamentally different from other natural systems. ...
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We prove that it is consistent that there is a non-reflexive Whitehead group, in fact one whose dual group is free. We also prove that it is consistent that there is a group A such that Ext(A,Z) is torsion and Hom(A,Z) = 0. As an application we show the consistency of the existence of new co-Moore spaces.
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ژورنال
عنوان ژورنال: Studia Mathematica
سال: 1997
ISSN: 0039-3223,1730-6337
DOI: 10.4064/sm-125-2-187-199