Boisot, M. H., Canals, A., & MacMillan, I. (2004). " Simulating I-Space (SIS): An agent-based approach to modeling knowledge flows http://entrepreneurship.wharton.upenn.edu/research/simispace3_200405.pdf." Working papers of the Sol C. Snider Entrepreneurial Research Center, Wharton School, University of Pennsylvania.
“Such knowledge [of contemporary physicists] is clearly not the same as that derived by abstraction from individual cases: abstraction can provide us with knowledge of accidents but not necessary attributes as such. If we find that the search for essences can in fact only take the form of abstraction from individual cases then Aristotle's account of what counts as an explanation in physics is an unrealisable ideal.”
Stephen Gaukroger (1978). Explanatory structures: a study of concepts of explanation ...
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British philosopher and intellectual historian 1954Related quotes
(2004), p. v
How Maps Work: Representation, Visualization, and Design (1995)

Source: Human Nature and the Social Order, 1902, p. 36

Encyclopedia of the Philosophical Sciences (1816)
Context: A philosophy without heart and a faith without intellect are abstractions from the true life of knowledge and faith. The man whom philosophy leaves cold, and the man whom real faith does not illuminate, may be assured that the fault lies in them, not in knowledge and faith. The former is still an alien to philosophy, the latter an alien to faith.

Source: The Embodied Mind (1991), p. 26, partly cited in: In 7 Quotes or Less http://evenhigherlearning.wordpress.com/2009/05/08/in-7-quotes-or-less-the-embodied-mind-by-francisco-j-varela-evan-thompson-and-eleanor-rosch/ at evenhigherlearning.wordpress.com, June 8, 2009

Source: The Homeless Mind: Modernization and Consciousness (1973), pp. 55-56

The Ethic of Freethought (Mar 6, 1883)

Variant translation: In our time, which thinks it can do without ideals, that it can reject what it calls abstractions, and nourish itself on realism, rationalism and positivism; which thinks it can reduce all questions to matters of science or to the employing of more or less ingenious expedients; at such a time, I say, there is but one resource if you are to avoid disaster, and only one which will make you certain of what course to hold upon a given day. It is the worship — to the exclusion of all others — of two Ideas in the field of morals: duty and discipline. And that worship further needs, if it is to bear fruit and produce results, knowledge and reason.
As quoted in "A Sketch of the Military Career of Marshal Foch" by Major A. Grasset
Source: Precepts and Judgments (1919), p. 150