# not+concrete

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**cement, concrete**— The two are not interchangeable. Cement is a constituent of concrete, which also contains sand, gravel, and crushed rock …102

**cement, concrete**— The two are not interchangeable. Cement is a constituent of concrete, which also contains sand, gravel, and crushed rock …103

**be set in concrete**— to be fixed and impossible to change The rules are not set in concrete …104

**plain concrete**— noun : concrete containing no steel reinforcing bars or wire or containing not more than two tenths of one percent of reinforcing …105

**Boolean algebra**— This article discusses the subject referred to as Boolean algebra. For the mathematical objects, see Boolean algebra (structure). Boolean algebra, as developed in 1854 by George Boole in his book An Investigation of the Laws of Thought,[1] is a… …106

**Boolean algebra (introduction)**— Boolean algebra, developed in 1854 by George Boole in his book An Investigation of the Laws of Thought , is a variant of ordinary algebra as taught in high school. Boolean algebra differs from ordinary algebra in three ways: in the values that… …107

**electronic music**— electronically produced sounds recorded on tape and arranged by the composer to form a musical composition. [1930 35] * * * Any music involving electronic processing (e.g., recording and editing on tape) and whose reproduction involves the use of …108

**Plato: ethics and politics**— A.W.Price I Plato followed his teacher Socrates into ethics by way of a question that remained central in Greek thought: what is the relation between the virtues or excellences (aretai) of character, and happiness (eudaimonia)?1 Both concepts… …109

**Paris arts faculty (The): Siger of Brabant, Boethius of Dacia, Radulphus Brito**— The Paris arts faculty: Siger of Brabant, Boethius of Dacia, Radulphus Brito Sten Ebbesen Throughout the thirteenth century Paris overshadowed all other universities in the arts as in theology. This chapter will deal almost exclusively with Paris …110

**Topos**— For topoi in literary theory, see Literary topos. For topoi in rhetorical invention, see Inventio. In mathematics, a topos (plural topoi or toposes ) is a type of category that behaves like the category of sheaves of sets on a topological space.… …