The waterfront development of Brooklyn was part of the "creative class theory" that drove much of Bloomberg's approach to infrastructure, Dulchin said.
In the international field the principle of unappeasable antagonism between the Soviet bloc and all other forms of political life, still based on "class" theory, dominated the agenda until it was abandoned in 1990.
That "no-classes" theory, via the contextual definitions for class terms, makes all the numbers "incomplete symbols", and so numbers can be seen as "logical fictions".
This would complete the project of the "no-classes" theory of classes by showing how all talk of classes can be reduced to the theory of propositional functions.
Russell (1906, 1907) tentatively proposed three alternative approaches: the zigzag theory, the theory of limitation of size, and the no-classes theory.
Finding an adequate definition of classes with the "no-classes theory" and the principles of logic needed to derive the properties of numbers and classes was only completed with Principia Mathematica (Whitehead and Russell 1910 13).
In the no-classes theory, classes are not independent entities and anything said about them is to be regarded as an abbreviation of a statement about their members and the propositional functions defining them.
This was followed by the theory of definite descriptions in 1905 and the "no-classes" theory for defining classes in Principia Mathematica in 1910, both of which involved the distinctive technique of contextual definition.
The main problem for interpreting the notion of logical construction is to understand what these various examples have in common, and how the construction of matter is comparable to either of the early constructions of numbers as classes or the theory of definite descriptions and "no-classes" theory of classes.
(3) One can apply the trace class theory to changes of boundary condition.
Russell's "No-Class" theory of classes from *20 of Principia Mathematica provides a contextual definition like that of the theory of definite descriptions.
