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A concrete category is a pair (C,U) such that . C is a category, and; U : C → Set (the category of sets and functions) is a faithful functor.; The functor U is to be thought of as a forgetful functor, which assigns to every object of C its "underlying set", and to every morphism in C its "underlying function".
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Ch 4, 3, 2, 2 The concrete can develop high compressive and tensile strengths, while shrinkage and creep remain acceptable, but will generally be less rigid than conventional mixes. The most obvious advantage is the low density, but these concretes also have low permeability to water and greater thermal insulation.
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From January 2008 to December 2012, if you bought shares in companies when Michael T. Smith joined the board, and sold them when he left, you would have a -6.7 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
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From November 2009 to December 2012, if you bought shares in companies when Jonathan Plutzik joined the board, and sold them when he left, you would have a -74.8 percent return on your investment, compared to a 36.8 percent return from the S&P 500.