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Garbage can model. The garbage can model (also known as garbage can process, or garbage can theory) describes the chaotic reality of organizational decision making in an organized anarchy. [2] The model originated in the 1972 seminal paper, A Garbage Can Model of Organizational Choice, written by Michael D. Cohen, James G. March, and Johan P ...
Routine activity theory is a sub-field of crime opportunity theory that focuses on situations of crimes. It was first proposed by Marcus Felson and Lawrence E. Cohen in their explanation of crime rate changes in the United States between 1947 and 1974. [1] The theory has been extensively applied and has become one of the most cited theories in ...
Paul Joseph Cohen (April 2, 1934 – March 23, 2007) [1] was an American mathematician. He is best known for his proofs that the continuum hypothesis and the axiom of choice are independent from Zermelo–Fraenkel set theory, for which he was awarded a Fields Medal.
Set theory is the branch of mathematical logic that studies sets, which can be informally described as collections of objects. Although objects of any kind can be collected into a set, set theory — as a branch of mathematics — is mostly concerned with those that are relevant to mathematics as a whole. The modern study of set theory was ...
Cohen, Stotland and Wolfe (1955), [3] in their work on individual differences in cognitive motivation, identified a "need for cognition" which they defined as "the individual's need to organize his experience meaningfully", the "need to structure relevant situations in meaningful, integrated ways", and "need to understand and make reasonable the experiential world" (p. 291).
To prove his result, Cohen developed the method of forcing, which has become a standard tool in set theory. Essentially, this method begins with a model of ZF in which CH holds, and constructs another model which contains more sets than the original, in a way that CH does not hold in the new model.
Minimal model (set theory) In set theory, a branch of mathematics, the minimal model is the minimal standard model of ZFC . The minimal model was introduced by Shepherdson ( 1951, 1952, 1953) and rediscovered by Cohen (1963) . The existence of a minimal model cannot be proved in ZFC, even assuming that ZFC is consistent, but follows from the ...
The topos definition first appeared somewhat obliquely, in or about 1960. General problems of so-called ' descent ' in algebraic geometry were considered, at the same period when the fundamental group was generalised to the algebraic geometry setting (as a pro-finite group). In the light of later work (c. 1970), 'descent' is part of the theory ...