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Mind & Society, 2012
It can be argued that dual-system theorists should adopt an action-based view of System 2 (S2), on which S2 reasoning is an intentional activity. It can also be argued that they should adopt a dual-attitude theory, on which the two systems have distinct sets of propositional attitudes.
Keith Frankish, Keith Frankish
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The dual of the dual as an approximation of the primal

International Journal of Systems Science, 1974
A formulation and some properties of the (Lagrangian) dual of the dual of a mathematical programming problem were presented in an article by Unger and Hurter (1972). Here, that formulation is simplified, so that the resulting form is more closely related to the primal.
A.P. Hurter, P.S. Unger
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The dual personality of NO

Trends in Pharmacological Sciences, 2000
In the body, nitric oxide (NO) is an important physiological regulator of functions such as vasodilatation and neurotransmission. Under pathological conditions, high concentrations of NO can be either beneficial(e.g. anti-bacterial, anti-parasitic and anti-viral) or detrimental; NO can therefore be considered a double-edged sword.
COLASANTI, Marco, SUZUKI H.
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Primal-Dual Interior-Point Methods

Other Titles in Applied Mathematics, 1997
Preface Notation 1. Introduction. Linear Programming Primal-Dual Methods The Central Path A Primal-Dual Framework Path-Following Methods Potential-Reduction Methods Infeasible Starting Points Superlinear Convergence Extensions Mehrotra's Predictor ...
Stephen J. Wright
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